GRE : Quantitative Comparison Problem





This is the Quantitative Comparison Problem-10.Understand the basic mathematical principles behind this problem and other problems.




Example-10


A student has test scores of 85, x and y and an average (arithmetic mean) score of 95 on the three tests.

Column A : The average (arithmetic mean) of x and y

Column B : 100



Answer


Since the average of three scores is 95, the total is 95 X 3 = 285.

If the score of one test is 85, the total of other tow tests is 285 – 85 = 200.

That means 85 + x + y = 295

= x + y = 295 – 85

= x + y = 200

This means the average of other two tests ( x & y ) is 200/2 = 100.

A is 100.

B is 100.

So, the answer is C.




This is the Quantitative Comparison Problem. Understand the basic mathematical principles behind this problem and other problems.

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