A bag contains 20 balls out of which'x' are black. If 10 more black balls
in the box, the probability of drawing a black ball is double of what it was
before. Find the value of x.
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Answer:
Probability of black balls =20x
Probability of black balls after adding 10 new balls =30x+10
According to the question
=30x+10=202x
20x+200=60x
⇒40x=200⇒x=5
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