Question

A bag contains 20 balls out of which x are black. if 10 more black balls are put in the box, the probability of drawing a black ball is double of what it was before. the value of x is

Answer 1

hope u got ur answer.

Answer 2

Answer:

For 20 balls , x balls = x/20

When 10 balls added then total balls = 30

For 30 balls , x balls=20+2x/30

ATQ

x/20=20+2x/30=5