stmnt 1: insuff as you do not know the relation between r1 and r2
stmnt 2: insuff as you do not know the relation between p1 and p2
together, since
p1 > p2 and
r2 > r1 therefore
p1r2 > p2r1 (population and representation cant be negative and both inequalities face the same direction so multiply directly. I tested this using +ve numbers and it seems to work fine.)
which is nothing but, p1/r1 > p2/r2. sufficient. answer C. hope this helps.
ratio
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gmatboost
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From the beginning you should write it as:
p1/r1 ? p2/r2
Whenever you see proportions with positive numbers, it is a good idea to cross-multiply:
p1r2 ? p2r1
So that way you have your eye out for any statement that helps you answer either of the above equivalent statements
p1/r1 ? p2/r2
Whenever you see proportions with positive numbers, it is a good idea to cross-multiply:
p1r2 ? p2r1
So that way you have your eye out for any statement that helps you answer either of the above equivalent statements
Greg Michnikov, Founder of GMAT Boost
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GMAT Boost offers 250+ challenging GMAT Math practice questions, each with a thorough video explanation, and 100+ GMAT Math video tips, each 90 seconds or less.
It's a total of 20+ hours of expert instruction for an introductory price of just $10.
View sample questions and tips without signing up, or sign up now for full access.
Also, check out the most useful GMAT Math blog on the internet here.
