If (x^3)(y^4)=5,000, is y=5?
(1)y is a positive integer.
(2)x is an integer.
I chose A, but the answer turned out to be C. Any explanation ???
5-Day Free Trial
5-day free, full-access trial TTP
Available with Beat the GMAT members only code
MORE DETAILS
DS - Set 25 Math
This topic has expert replies
If X were not an integer than X^3 could be a fraction such that the cubed root of x were equal to 1/2 and Y=10. Or if x were an integer than y=5 without knowing that the data is insufficient. That is the best I can come up with not sure if it is correct, but I think so.
-
Prasanna
- Master | Next Rank: 500 Posts
- Posts: 418
- Joined: Mon Feb 26, 2007 6:41 pm
- Thanked: 24 times
One way of looking at this could be to factorize 5000 which is 2*2*2*5*5*5*5. When we consider both the statements, we know that both x and y should be positive numbers and hence y=5drhomler wrote:If X were not an integer than X^3 could be a fraction such that the cubed root of x were equal to 1/2 and Y=10. Or if x were an integer than y=5 without knowing that the data is insufficient. That is the best I can come up with not sure if it is correct, but I think so.
