GMAT Math

hey guys ron has already gone over this question here: https://www.manhattangmat.com/forums/hen ... t2911.html

I just wanted to ask experts what category is this question technically? Is this a word problem? Also, what level of difficulty is it? I know how to set it up; however, it seems questions that I am missing are ones in which you can't back solve for and you must abstractly figure it out. Thoughts on these types of questions?


This year Henry will save a certain amount of his income, and he will spend the rest. Next year Henry will have no income, but for each dollar that he saves this year, he will have 1 + r dollars available to spend. In terms of r, what fraction of his income should Henry save this year so that next year the amount he has available to spend will be equal to half the amount that he spends this year?

a) 1/(r+2)
b) 1/(2r+s)
c) 1/(3r+2)
d) 1/(r+3)
e) 1/(2r+3)

This question is from GMAT Focus Test #2

Answer: E -

Brent,

First of all, thank you so much for your timely response. Secondly, do you have more practice questions of this type?

I just realized something, that perhaps this test is so hard to study for simply because they never have the problems categorically available in a quantity that makes it easy to learn; thus, if I could get more quesitons such as the ones that you have provided I will be able to learn this question type more efficiently.

Thanks

-BP

Hi,

That is a great question and a tough one. Try out these two from the problem solving of the Official Guide 13th Edition: #177, #198

It's great to able to do these questions both by picking numbers and algebra. These questions really test out your ability to translate the words to numbers/variable, manipulate equations, and keep track of what you are solving for.

I hope this is helpful. Let me know if you have any questions on those.

HG.

Either the same, or a similar question is from OG13 , and i agree this is one of the most brutal questions in the OG..

Just a word to the wise. Plugging in numbers is often the best way to solve, but do spend time studying the algebra to enhance your understanding of the concept.