Last Updated on May 4, 2023
GMAT OFFICIAL GUIDE PS
Solution:
To solve we want to first create a word translation from the information in the problem stem. We are given that x is m percent of y. We can express this as:
x = (m/100)y
x = my/100
We are next asked, in terms of m, y is what percent of x? This can be expressed as:
y/x * 100 = ?
We need to manipulate our first equation until we isolate y/x.
x = my/100
Multiplying the entire equation by 100 we have:
100x = my
Then divide both sides by x:
100 = my/x
Then divide both sides by m:
100/m = y/x
The final step is to multiply both sides of the equation by 100.
100/m * 100 = y/x * 100
10,000/m = y/x * 100
Answer: E