If y > 0, then x is what percent of y?

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M7MBA: Moderator; Posts: 2058; Joined: Sun Oct 29, 2017 4:24 amFollowed by: 5 members; Thanked: 1 times

by M7MBA » Thu Mar 01, 2018 7:11 am

If y > 0, then x is what percent of y?

(1) y = 5x
(2) x = 5

The OA is the option A.

How can I know the percent that x represents? Experts, may you help here? Thanks in advanced.

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Source: Beat The GMAT — Data Sufficiency | Thu Mar 01, 2018 7:11 am

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Jay@ManhattanReview: GMAT Instructor; Posts: 3008; Joined: Mon Aug 22, 2016 6:19 amFollowed by: 34 members; Location: Grand Central / New York; Thanked: 470 times

by Jay@ManhattanReview » Mon Mar 05, 2018 2:53 am

M7MBA wrote:If y > 0, then x is what percent of y?

(1) y = 5x
(2) x = 5

The OA is the option A.

How can I know the percent that x represents? Experts, may you help here? Thanks in advanced.

The expression "x is what percent of y" can mathematically be written as x = p% of y, where p is the answer.

Thus, x = p%*y => x = py/100 => p = (x/y)*100

If we get the value of x/y, we get the answer.

Let's take each statement one by one.

(1) y = 5x

=> x/y = 1/5. Sufficient.

(2) x = 5

We do not have any information about y. Insufficient.

The correct answer: A

Hope this helps!
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