GMAT Quantitative Reasoning Practice Test 4

Question : 82 of 100

Marks: +1, -0

In a blue jar there are red, white and green balls. The probability of drawing a red ball is 1/5. The probability of drawing a red ball, returning it, and then drawing a white ball is 1/10. What is the probability of drawing a white ball?

1/5
1/2
1/3
3/10
1/4

Validate

Solution:

Indicate

A

as the probability of drawing a white ball from the jar.
The probability of drawing a red ball is

1 / 5

.
The probability of drawing both events is

1 / 10

so,

1/ 5 × A=1 / 10

.
Therefore,

A=1 / 2

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