He didn't explain nicely that's why, Basically you say, how many times can 4 go into 1 which is 0, then you say how many times can 4 go into 15, which is 3 times, the guy is trying though
Dude I solved that in my head within 4 seconds by just taking 400 and knowing 4 goes into 100 then taking 4x4 and getting 16.. then just jumped to c instantly because the other 2 are just way to small.
You didn’t solve it, with your way it could’ve easily been 400 hence why they have it as an answer choice. The easiest way to get an exact answer is divide 15 by 4 then multiply by 100 giving you 375. Ofc you’ll need a calculator or paper to write the math unless you know solving Strategies.
Or just estimate - instead, do 5% of what number is 15? 375 / 10 = 37.5 / 2 = 18.75 (5% of 375)...drop 20% from 5% to 4% (18.75/5*4) = 15. You don't even need to get to the final number - just doing rough estimates of 400 (10% of 400 /2 = 20) and 325 (10% of 325 / 2 = 16.25) exposes the answer.
I got that number (375) by basic arithmetic in about 20 seconds. I'm an engineer, but most of my math is electronically-moderated, these days. If you are using whole numbers, as in this problem, there's no need at all to go into long division.... 4% = 15, so 40% = 150. 2 x 40% = 80% = 300. 20% = 75.....therefore 100% = 375.
You can guesstimate. 4 times 400 is 1600. The next is 4 times 375 which is 1500, so 375 is the answer because the first two digits are 15. (4 times 325 is 1300 and 4 times 275 is 1100).
Simpler solution: 15/4=3.75 it is 1% then multiply by 100 and you get 375 For example: 37% of what number is 152? 152/37=4.1081 is 1%, so times 100 and we get 410.81 ^^ :D
I actually use a different method: In this kinda of problem it’s never the biggest or the smallest number. It’s usually between two numbers that are close to each other, so I automatically eliminated A and D. Then, I noticed A is similar in other digits to C, and it looked oddly logical to pick C, so I did. Then I skipped to the end and saw I was right. 😂
@GrammarHero I learned the long way so either way I was good. Nice to even see it. Now a days isn't long division illustrated different? For got what the method is called
Or, and i'm using approximations not precision...if you add 1% to make it 5%, then that of 100 is 5. What brings 5% to 15%? 300% as 3 x 5=15 and 3 x 100 is 300.. So the answer is going to be in the 300-400 range. So how do you get more precise? (And yes, this is clearly more difficult than it has to be)... 5% of 300 is 15. So the answer must be 375 because you only increased the random measure by 1% and your solution is 385 by 5%. Meaning: your solution can only be greater or less than the target by a few digits. If you take 10% of 300, you get a solution of 370, which is still greater than 325. If you take 15% of 300, you get a solution of 355; still greater than 325. They are trying to trick you into thinking this is difficult to do in your head. It's not. Recognize and manipulate the integers to fit a reasonable equation, if possible. That's why they went with 4% and 15.
Pro tip: sometimes the long solution is shown, because the numbers will almost certainly be different on the test and will require a method that works, no matter what the numbers are.
or...a MUCH MORE SIMPLER WAY OF DOING IT: the question is;'4% of what number=15' so the equation will be: 4%•x(variable)=15 to start of, let's simplify 4% into it's actual raw decimal form---> 4%=4/100=0.04 so now, 0.04•x=15, now to cancel the 0.04; you can do this in 2ways which ultimately do the same exact thing way number1: 0.04•x=15 --> x=15/0.04=375 way number2: 0.04•x=15 --> 0.04/0.04•x=15/0.04 --> x=15/0.04=375 doesn't matter, the real important questions are: what on god's glorious green and blue earth is that longer than my whole entire bloodline of a workout when the answer is that simple...? And speaking of which, how is this "ASVAB Arithmetic Reasoning Practice Q" what actually is that because my guy I took this stuff in grade6..💀?
Thank you for how you brake down the answer your teaching how to do so many things in one problem! Like how to write out the problem, percent into a decimal, and dividing by decimal so awesome!!!
I am surprised not seeing people talking about basic rule called ( règle de trois in french ) maybe translated rule of 3 is English who knows. It goes like this ; If 4% = 15 100% = ? You multiply the diagonal first and divide the result with the last number giving you the answer. So ( 15 × 100 )/ 4 should give you 375.
Four percent is 1/25 of 100, so just multiply 15 by 25: 15(25) = 375.
Right!
That's what I was going to say pretty much
This is what I did
That’s what I did also but the issue is that it only works because 4 goes into 100 without remainders.
Literally
Or 15 ÷ 4 = 3.75 which is 1%. Multiplied by 100 is 375 which is 100%.
exactly where my home-schooled brain went! 100%
That's my boomer cheat.
I did 1% of all the answers and multiplied by 4. Multiple choice questions are just too easy.
That won't always work for some of these questions, which is why I show the formal solutions, not the shortcuts.
when in doubt choose C
or just do 15 X 25.
Love the long division Just how I was taught
Always "is" over "of" = % over 100
That's what I learned back in the 70's. So simple, and it works.
YES!!! Finally someone else has heard of this formula.
15/4 = a
a*100 = c
C.375
Basic % finding formula : 4% = 15/n x 100%
So n = 15/4% x 100% = 375 :)
4% is 1/25th of a number(like 100)
25 x 15 = ? , ends in 5?
4×25=100 same way 15×25=375
How did u get 15?
@@jamaljacobs9771 From the question
I just multiplied 15 by 25. Much easier.
How’d u get 3 I’m so lost I can’t believe I can’t solve basic math 😭
4 x 2 = 12? It was mentioned in the video. I also have videos on decimals and long division if you need a refresher!
4% is also 4/100 so x*(4/100)=15 then you can solve by multiplying 100 and dividing by 4 on both sides
Me too...I m watching ten times reading comments that are confusing me.
Bruh how, the guy just says how he got the 12, not the 3 likee
He didn't explain nicely that's why,
Basically you say, how many times can 4 go into 1 which is 0, then you say how many times can 4 go into 15, which is 3 times, the guy is trying though
Cant you just take 15 × 25 knowing 4 goes into 100 25 times
Dude I solved that in my head within 4 seconds by just taking 400 and knowing 4 goes into 100 then taking 4x4 and getting 16.. then just jumped to c instantly because the other 2 are just way to small.
Same
Exactly , 4 is 4% of 100 easy to solve from there always go to the nearest zero for easy math in your head
You didn’t solve it, with your way it could’ve easily been 400 hence why they have it as an answer choice. The easiest way to get an exact answer is divide 15 by 4 then multiply by 100 giving you 375. Ofc you’ll need a calculator or paper to write the math unless you know solving
Strategies.
good dood
every number times .04 until u get ur number
same thing I was thinking might take a little longer but still effective.
i just looked at it and knew. too easy
C. I multiplied but got higher number!
Cross multiplication are much simpler. 4/100=15/X
15x100=1500 Divide by 4.
Process of elimination. 3×4 is 12 so around that ball park. 25×4 is 100 so that would make 325 into 13.
1% of each is easy 4x 1% its obvious 3.75x4=15
Or just estimate - instead, do 5% of what number is 15? 375 / 10 = 37.5 / 2 = 18.75 (5% of 375)...drop 20% from 5% to 4% (18.75/5*4) = 15. You don't even need to get to the final number - just doing rough estimates of 400 (10% of 400 /2 = 20) and 325 (10% of 325 / 2 = 16.25) exposes the answer.
It does, because I set the answers far apart. If they were closer together--and they almost certainly will be on test day--you have to work it out.
I got that number (375) by basic arithmetic in about 20 seconds. I'm an engineer, but most of my math is electronically-moderated, these days. If you are using whole numbers, as in this problem, there's no need at all to go into long division....
4% = 15, so 40% = 150. 2 x 40% = 80% = 300. 20% = 75.....therefore 100% = 375.
15x100=1,500
1,500÷4=375 Done
40% is 150, you just do 15 x 10
20% is 75
80% is 300
Add 80%(300) and 20%(75) to get 375
save the time n move on after 37
If I wasn't making a tutorial video, I certainly would!
I multiple 25
You can guesstimate. 4 times 400 is 1600. The next is 4 times 375 which is 1500, so 375 is the answer because the first two digits are 15. (4 times 325 is 1300 and 4 times 275 is 1100).
IIT IIM Grad here
4% of 400 = 16
Since we want 15, 375 is the answer.
3 and 3/4 times 100. Done in milliseconds in my head...
I will sleep a lot better,Tonight now , Thanks!
I got the same answer by multiplying.
15÷4×100
Math is beautiful any which way you solve it
Wait where does the 3 and 7 come from??
Simpler solution: 15/4=3.75 it is 1% then multiply by 100 and you get 375
For example: 37% of what number is 152?
152/37=4.1081 is 1%, so times 100 and we get 410.81
^^ :D
Wow done that in 4 seconds
4%•25=100% 25•15=375 🙌
Got it right in secs
Invented stratgies and mental math are quicker. I multiplied 15 by 10 to get 40%. Then built up to 100% by multiplying by two and adding half of 40%.
15/4% (15x 0.04):375
I actually use a different method: In this kinda of problem it’s never the biggest or the smallest number. It’s usually between two numbers that are close to each other, so I automatically eliminated A and D. Then, I noticed A is similar in other digits to C, and it looked oddly logical to pick C, so I did. Then I skipped to the end and saw I was right. 😂
4 divide by 100 = 25. 15 X 25 = 375. Just follow the rule. Percentage is always out of 100 then go from there.
0.04x=15 => 4x=1500 => x=375
What I did is just 15 × 100 ÷ 4 and got 375 easy
he showed the long division way which was nice I think kids should learn that then get calculators
On this test, you are not permitted to have a calculator, which is why I worked all of these out by hand.
@GrammarHero I learned the long way so either way I was good. Nice to even see it. Now a days isn't long division illustrated different? For got what the method is called
.04 ÷ 15, move decimal twice, 4÷1500=375.
(15/4) x100
Take 15 and divide it by 4 then multiply by 100
Where do you get that 7?
Errr...what about working out that 1% is 3.75 (?)
15 ÷ .04= 375... whoop whoop!!!
C375
15/4=3,75 --> 3,75x100=375
Make 2 columns. Col 1: 4%x5=20%; then 20x5=100%. Column 2, do the same to 15: 15x5=75; 75x5=375.
15/0,04=1500/4=375
How did you get 7 ?
Just apply some logic to it. Take 1%of each of the choices and multiply it by 4. Take the one that's closest to 15 which is c.
Or say 0.04 = 4/100, then 15/(4/100) = 1500/4 = 375.
process of elimination would be faster. 15= 3 x 5. Looking at the answers only one has a multiple of 3. C
15* 100/4 =1500/4=750/2=375
U could just do 15x100 then divide by 4
How did you get the 100
@@ArielDaDonnbc a percentage is always out of 100
C
375=15*25
4/100=25*15=375
Or half of 15 x 50, 75 x5=375
375
25×15
When in doubt, “C” … Charlie out.
I'm not so sure that is the best strategy. ¯\_(ツ)_/¯
Or 375 x 1% = 3,75 x 4 = 15
Or you could do it the straightforward way, 15x100÷4=375
4%÷100×375÷1=15 this is the easy way to find out
Just multiple 100 ×15 =1500÷4 =375
100? Because of 100%
Where did u get 100
And does that work for all % problems
Easier to multiply both sides by 25.
15 * 100 / 4 = 375
C) 375*0.04 is 15
Just 1500/4=375
What times 4 is equal to 100%. Take that and multiply the 15. That's it
375 x 4 = 1500
Lets do it with brain calculation, So if 15 is 4% of the number
30 would be 8%
75 would be 20%
75*5 = 375
375*0.04=
A
It's easier to just say 100/4=25 times 15
375 x .04 😊
I wouldve made that 4% into a fraction. Still get the same answer.
Of course.
4 goes into 100, 25 times. 25x15=375. Simple.
Or, and i'm using approximations not precision...if you add 1% to make it 5%, then that of 100 is 5. What brings 5% to 15%? 300% as 3 x 5=15 and 3 x 100 is 300.. So the answer is going to be in the 300-400 range.
So how do you get more precise? (And yes, this is clearly more difficult than it has to be)...
5% of 300 is 15. So the answer must be 375 because you only increased the random measure by 1% and your solution is 385 by 5%.
Meaning: your solution can only be greater or less than the target by a few digits. If you take 10% of 300, you get a solution of 370, which is still greater than 325. If you take 15% of 300, you get a solution of 355; still greater than 325.
They are trying to trick you into thinking this is difficult to do in your head. It's not. Recognize and manipulate the integers to fit a reasonable equation, if possible.
That's why they went with 4% and 15.
Pro tip: sometimes the long solution is shown, because the numbers will almost certainly be different on the test and will require a method that works, no matter what the numbers are.
Or...400 minus 25. 400 coming from 4 x 100, and 25% being the 4% of 100.
Just multiply it by the answers.
(15x100)/4=375
100----4
? ----15
By cross multiplication
(100*15)/4
=375
See it's that simple
Just guess C
or...a MUCH MORE SIMPLER WAY OF DOING IT:
the question is;'4% of what number=15'
so the equation will be: 4%•x(variable)=15
to start of, let's simplify 4% into it's actual raw decimal form---> 4%=4/100=0.04
so now, 0.04•x=15, now to cancel the 0.04; you can do this in 2ways which ultimately do the same exact thing
way number1: 0.04•x=15 --> x=15/0.04=375
way number2:
0.04•x=15 --> 0.04/0.04•x=15/0.04 --> x=15/0.04=375
doesn't matter, the real important questions are: what on god's glorious green and blue earth is that longer than my whole entire bloodline of a workout when the answer is that simple...?
And speaking of which, how is this "ASVAB Arithmetic Reasoning Practice Q" what actually is that because my guy I took this stuff in grade6..💀?
The math sections on the ASVAB go from about 3rd to 10th grade math.
Never take an ASVAB military test-I took one of these in the 90’s/2000
The test has been the same since before Vietnam.
Thank you for how you brake down the answer your teaching how to do so many things in one problem! Like how to write out the problem, percent into a decimal, and dividing by decimal so awesome!!!
You're welcome! It's not easy to do all of that in 60 seconds!
15/.04=375
375🎉🎉
Anyone else just times 15 by 25 right away?
Yeah, I'm cooked.
¯\_(ツ)_/¯ Come on, these are too hard!
(15/4)x100. Takes a few seconds…
I am surprised not seeing people talking about basic rule called ( règle de trois in french ) maybe translated rule of 3 is English who knows. It goes like this ;
If 4% = 15
100% = ?
You multiply the diagonal first and divide the result with the last number giving you the answer.
So ( 15 × 100 )/ 4 should give you 375.
In other videos, I solve questions using that method.
Here: ruclips.net/user/shortsRomJMs69Zbw
Or since you did the equation just type in .04 ×what ever number that equals 15
No calculator on this test!