GMAT Quantitative Reasoning Practice Test 5

Question : 16 of 100

Marks: +1, -0

In a jar there are balls in different colors: blue, red, green and yellow.
- The probability of drawing a blue ball is

1 / 8

.
- The probability of drawing a red ball is

1 / 5

.
- The probability of drawing a green ball is

1 / 10

.
If a jar cannot contain more than 50 balls, how many yellow balls are in the Jar?

Solution:

1/8

is the probability of drawing a blue ball then there are

40/8 = 5

blue balls in the jar. And with the same principle there are 8 red balls and 4 green ones.

40 − 5 − 8 − 4 = 23

balls (yellow is the only color left)

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