A bag contains 4 red and some black balls. A ball is picked from the bag at random. If the probability of it being a black ball is twice that of a red ball, then the number of black balls in that bag is:

A bag contains 4 red and some black balls. A ball is picked from the b

1.	A bag contains 4 red and some black balls. A ball is picked from the bag at random. If the probability of it being a black ball is twice that of a red ball, then the number of black balls in that bag is:
A.	4
B.	8
C.	12
D.	16
Answer» C. 12

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A bag contains 4 red and some black balls. A ball is picked from the bag at random. If the probability of it being a black ball is twice that of a red ball, then the number of black balls in that bag is:

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