Q7 doesn't need calculation if you're confident in your percentage skills. If they put $4000 each time and ended up with the same amount of money, then it would be obvious that the rate for the second account must have been 6%. But they didn't put the same amount of money, he put 2k more in second account, so the rate must have been slightly smaller for it to have the same amount as in the first one, so the only possible answer is 4.
Second Last Question: I am not really sure if this is a valid method, but lets say we start with m~1/n^2. m goes up by 2.25, so we have 2.25m ~ 1/(n_new)^2 . lets assume we started with m=1, n=1. so the equation becomes 2.25 ~ 1/(n_new)^2. solve for n_new and we get n_new = 0.66666... The n which was initially 1 has gone down to 0.6666...so it changed by 0.3333 meaning 33.3333..%
I have not taken the GRE yet, but the GRE prep book I have ("The 5lb Book of GRE Practice Problems") does include a lot of compound interest questions.
The 5-lb. book is absolutely wonderful if you want tons of extra practice, but keep in mind that it was published by a third party -- not by the creators of the GRE. Personally, I think Manhattan Prep did a lovely thing by making that book so comprehensive, but what gets lost in the shuffle is that some question types are exceedingly rare on the GRE, but still (very understandably) get plenty of attention in that book. When we examine every official GRE question that's been published by the test's creators -- along with questions we've seen when we take the exam ourselves -- we just don't see all that many compound interest problems. We can easily count them all on one hand, for better or worse. Is it worth practicing compound interest problems for the GRE? Sure, if you're trying to scrap and claw for every little point -- there's always a chance that you'll see a question or two on the exam. The more likely outcome is that you won't see any at all, so if you don't have much study time, I wouldn't invest too heavily in that particular question type. I hope that helps a bit, and have fun studying!
@@GRENinjaTutoring Thanks so much! I was considering including the compound interest formula on my list of important formulas to know, but I'm glad I do not have to worry! I love your videos, they have been so helpful!!
Q3 is much easier if you just set a number for r, I set it as 100 to make it dead easy and got 80, the whole thing took 20 seconds max.
Q7 doesn't need calculation if you're confident in your percentage skills. If they put $4000 each time and ended up with the same amount of money, then it would be obvious that the rate for the second account must have been 6%. But they didn't put the same amount of money, he put 2k more in second account, so the rate must have been slightly smaller for it to have the same amount as in the first one, so the only possible answer is 4.
Second Last Question:
I am not really sure if this is a valid method, but lets say we start with m~1/n^2. m goes up by 2.25, so we have 2.25m ~ 1/(n_new)^2 . lets assume we started with m=1, n=1. so the equation becomes 2.25 ~ 1/(n_new)^2. solve for n_new and we get n_new = 0.66666... The n which was initially 1 has gone down to 0.6666...so it changed by 0.3333 meaning 33.3333..%
THANK YOU!!!
The way she did it was to minimize as possible the use of calculator
the second last question how 2/3 converted into 1/3 whats behind the logic when 125% up so n goes down with 1/3 % can u explain it?
This was really helpful. Thank you sm :)
I have not taken the GRE yet, but the GRE prep book I have ("The 5lb Book of GRE Practice Problems") does include a lot of compound interest questions.
The 5-lb. book is absolutely wonderful if you want tons of extra practice, but keep in mind that it was published by a third party -- not by the creators of the GRE.
Personally, I think Manhattan Prep did a lovely thing by making that book so comprehensive, but what gets lost in the shuffle is that some question types are exceedingly rare on the GRE, but still (very understandably) get plenty of attention in that book. When we examine every official GRE question that's been published by the test's creators -- along with questions we've seen when we take the exam ourselves -- we just don't see all that many compound interest problems. We can easily count them all on one hand, for better or worse.
Is it worth practicing compound interest problems for the GRE? Sure, if you're trying to scrap and claw for every little point -- there's always a chance that you'll see a question or two on the exam. The more likely outcome is that you won't see any at all, so if you don't have much study time, I wouldn't invest too heavily in that particular question type.
I hope that helps a bit, and have fun studying!
@@GRENinjaTutoring Thanks so much! I was considering including the compound interest formula on my list of important formulas to know, but I'm glad I do not have to worry!
I love your videos, they have been so helpful!!
Thank you, Michael! And wow, you're quick. :)
Have fun studying, and please keep us posted on your progress!
@@GRENinjaTutoring Hi, in general, what resources would you recommend for someone who wants to score 167+ on the quant portion of the actual test?