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This series is designed to help you step up your Data Sufficiency practice while we all spend a little extra time at home during the coronavirus situation; I’m going to publish one practice Data Sufficiency question each day! You can choose to do all of them, or none of them. 

Click on the tag “Social Distancing DS Challenge” at the bottom of this post to see all of the questions in this series! 

And remember to take whatever precautions you need to stay healthy over the next few weeks! 

Question #7

If a and b are positive integers, a is what percent of b ?

(1) (1/4)*b = a
(2) a/b = 20/80

 Explanation

To find a as a percent of b is the same as finding the ratio of a to b. Simply stated, we need to know one value in terms of the other, which is given to us in each statement. Don’t do the math! Just note the fact that you could do it using the information in either statement, select choice D (each is sufficient independently), and move on.

If you’re having trouble, just make up a value for either a or b and test it out for yourself. The correct answer is (D).