To close a valve It takes 80 turns; you have turned the valve 15 times, what % of the job remains?
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- Опубликовано: 1 окт 2024
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81.25%
100% - 18.75%
Well I got this answer but I did it different. 80 turns=100% ,8=10%,so 1 turn=1.25%, 16 turns = 20%-1.25 for 1 turn is then 18.75% so 100%-18.75=81.25%. Long way around but I got there.
I was sloppy I went least common denominator and got 3/16. 12/16 = 75% therefore 13/16 =81%+. This is good enough to check the calculator answer.
I LIKE IT:
100% / 80 turns = 1.25%/turn
15turn × 1.25%/turn
= 18.75% used
100%total - 18.75%used
= 81.25% remaining
I expressed 100 as a fraction of the 80, getting 1.25, then multiplied the 15 by this, to get 18.75, this being the "turns completed" percentage and subtracted this from the full 100%, giving me 81.25% as the % of the job remaining.
@@SimonGardner-qu4vu good job
Simply divide 15 by 80 which equals 18.75 percent then subtract from 100 percent; the result is 81.25 percent remains.
1 turn is 1,25% (100% : 80). Then 80 - 15 = 65 turns = 65 x 1,25% = 81,25 of the job still has to be done. :)
What is this? I thought this my 3rd grader last term. No kidding. He can easily do a subtraction n a division. He does not have to think 2 what % is of 4. Can't see this as middle / high school. Def primary.
It depends on whether it is a Go-Flo (r) model 81.25 or a Delta model 13/16. If it's a Go-flo model, you'd have 81.25 percent of the job left to complete it, but if it's the Delta model- granted, Delta faucets are better quality according to Consumer Reports, and in that case, you'd only have 81 and a quarter percent of the job left.
I didnt realise the go flo was metric while the delta was old money, I was wondering why the 15mm pipe wouldnt fit in the delta and keep leaking, I was padding it out with ptfe tape
81.25
Of all the teachers I've had throughout life math teachers were the best.
Great content! I got the right answer, but used a different method involving ratios: 80 turns/100 percent =15 turns/x percent. Cross multiply and solve for x, x=18.75 percent. This is the percent of turns completed. to find the percent left to complete, subtract 18.75 from 100 to get the correct answer of 82.25 percent. I like your approach better; it didn't occur to me though!
Greetings. The answer is 81.25%. We determined the answer by subtracting the number of turns completed from the total number of turns to be completed. That is 80-15=65. Now, to determine the % of job left to be done, we will divide 65 by 80 and multiply the result by 100. Moving on mentally, we divide 65 by 80 to get 13/16. Thereafter, we multiply 13/16 by 100 to get
13/4 ×25, and 13×25/4 gives
325/4=81 and 1/4, all done mentally without the use of a calculator.
(25×13)= 3x5=15, set down 5 and carry 1, then 3×2=6 plus the the 1 carried forward to get 7, then 1×5=5 plus 7 to get 12, set down 2 and carry 1, finally 1 ×2=2 plus 1=3, and the result of (25×13) is 325 for the numerator.
got it 81.25 easy 65 / 80 = 81.25 thanks for the fun.
65 / 80 = 0.8125 and then you multiply by 100
I did it the opposite way. I divided 15 by 80, to get 18.75 percent of the job completed. I subtracted that from 100, to get 81.25% left to go. The way shown would have actually been easier!
That seemed very long winded. 15/80 X 100 = 18.75 % ------- 100% minus 18.75% = 81.25% left to do.
Super easy to solve without paper or calculator if one is familiar with fractional measurements. 15/80 reduces to 3/16 which leaves 13/16 to finish the valve closing. 13/16 as (almost) everyone knows is .8125. For percent just multiply by 100 and there it is, 81.25%
My biggest problem was my compulsion to daydream. but i loved that about my brain and feared losing it. so i looked out the window in math class and found myself in summer school! then when math became more complex, it connected with the imaginative part of my intellect and it was SO much easier for me. i saw a 60 minutes interview with a little kid math genius and he said " When Math gets VERY complex, it starts to approach art.
I don't agree with this. The correct solution is to replace any valve in your house that requires 80 turns to close! Problem solved.
15 turns means that there are 65 turns still to go
so we need to work out what percentage of 80 is 65
65/80 x 100 = 81.25 81.25% of the job remains
Thanks John,
You teach math in a way folks can understand .
Another cream puff. Thanks Boss.
nice!
and also first!!!
I misread it... my answer was 18.75% done.
I worked from 8 x 125 = 1000, giving 1/80 = 1.25 %.
1. 80 turns - 15 turns = 65 turns remaining.
2. Converting the 65 turns remaining to % gives 65 x 1.25 % or 81% to the nearest %.
(I did the calculation by sight, so I did it to the nearest %)
Solved in my head at the thumbnail, my answer is 81.25% remaining.
Mental math isn't as rigorous as formal mathematics, and won't fly on an exam wanting to see your work to verify you know the "correct" way of doing things so as to build on them for future concepts, but it can be a fun exercise anyway.
First, doing 15 turns when it takes 80 to close the valve means we're dong 3/16 of the job to strt, leaving 7/16 remaining.
3/16 is 0.1875 : 2/16 = 1/8 = 0.125. amd another 1/16 is half that, .0625..
1 - .1875 = .8125 = 81.25% remaining.
Ans=remaining work=80--15=65
Work remains=65/80×100%. N.
A=(15÷80)×100 is formula for conver into % and job remain is A-100
Sorry 100-A
Yay! Still sharp! I got it right! Thanks for letting me keep my math skills sharpened! I send your problems on to my old classmate, I love math! Always believed in showing the steps and showing my steps! Big believer of this as I needed to see if my students understood how to get their answers.. I hate mental math if doing it in your head!
(1.00 - (15/80)) = .8125 => .8125 x 100% = 81.25%
15/80=.1875%
100-18.75=81.25
100-18.75=81.75%
81.25%
Answer is 81.25%
81.25%
81.25%
81.25%
81.25%
81.25%
81.25%
This is a proportion/percentage problem.
18.75
Another poorly written question . It is not necessary to know the percent required but the number of turns left and a test to make sure it is fully closed
You left a poorly written comment. Hint ... You are *not* the teacher here.
Question ,are you turning the valve fully 360 degrees for each turn ,OR how much are you turning the valve . QUESTION #2 : is the valve closure truly linear , there are many that are not linear .
It's on a ... need to know basis and you don't need to know.
Greetings. Are. you are an engineer?
65/80 x 100
i like the older version over 3 years ago or 2 idk but he helped me alot with my grade 8 homework and exams
thanks for the reminder for how to set this up! 😊
(1-(15/80))*100%= 81.25%
81.25 percent to tight up the valve 💀😂✌
Thank you for turning on my brain.
I got 81.25%
🫡
65/80=.8125
81.25%
84%
Thank you.
Kindergarten math
Math starts at the beginning... word problems started after the basics... would you like a fully differential equation to solve?
Oh! You mean that you are extraordinarily smart, and this Math is too simple for you?
Why don’t you start your own Math channel for the smarty-pants, like you, and see how successful it would be?
You will feel so lonely 😢
@@chrisdissanayake6979 Well said. I couldn't have said it better myself. 👍