A bag contains 20 balls, of which x balls are blue. If one ball is drawn at random, find the probability of drawing a blue ball. If 10 more blue balls are put in the bag, and a ball is drawn at random then the probability of getting a blue ball is double the probability obtained before. Find x.
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Answered by
27
probability of getting blue ball=x/20
balls in bag=x+10
(x+10)/20=x/10
20x=10x+100
x=10
balls in bag=x+10
(x+10)/20=x/10
20x=10x+100
x=10
Answered by
4
Probability of getting blue ball =x/20
Balls in bag =x+10
> x+10/20=x/10
> 20x=10x+100
(x=10)
>>20x=10x+100
>>>>>>>>>>>>>>{x=10}<<<<<<<<<<<<<<<
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