A box contains 12 balls of which some are red in colour. If 6 more red balls are
put in the box and a ball is drawn at random, the probability of drawing a red
ball doubles than what it was before. Find the number of red balls in the box.
[CBSE 2018]
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the number Given
,Total balls in the box = 12
Red balls in the box = x
Probability of drawing a red = Number of red balls
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total numbers of balls
x
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12
If 6 more red balls are put in the box,
Total number of balls = 12 + 6 = 18
Number of red balls x + 6
Probability of drawing a red balls = x+6/18
Hope it helps u
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