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Question

A bag contains 14 balls of which x are white . If 6 more white balls are added to the bag,the probability of drawing a white ball is 12, then x=


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Solution

Total number of balls =14

Number of white balls =x

If 6 more white balls were added then ,

Total number of balls =14+6=20

Number of white balls =x+6

Probability of drawing a white ball is =12

Probability=numberofwhiteballstotalnumberofballs

x+620=12x+6=202=10x+6=10x=10-6=4

Hence the number of white balls are 4.


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