GMAT Quantitative Reasoning Practice Test 1

Question : 5 of 100

Marks: +1, -0

In a box there are

A

green balls,

3 A+6

red balls and 2 yellow ones.
If there are no other colors, what is the probability of taking out a green or a yellow ball?

Solution:

The number of green and yellow balls in the box is

A+2

. The total number of balls is

4 A+8

. The probability of taking out a green or a yellow ball is:

\;{A+2}/{4 A+8}=\;{1}/{4}

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