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CBSE Class 10 Answered

A box contains 12 balls out of which x are black. If one ball is drawn at random from the box, what is the probability that it will be a black ball? If 6 more black balls are put in the box, the probability of drawing a black ball now is double of what it was before. Find x.
Asked by Topperlearning User | 27 Jul, 2017, 04:33: PM
answered-by-expert Expert Answer

Total number of balls = 12

Let the number of black balls be x.

P(drawing a black ball) =

It is given that 6 more black balls are put in the box.

Now, we have:

Total number of balls = 18

Number of black balls = x + 6

P (drawing a black ball) =

Therefore, we have:

Answered by | 27 Jul, 2017, 06:33: PM

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