Question

A bag contains only red and blue balls. The probability of drawing a red ball from the bag is 3/5. If 4 more blue balls are added to the bag, the probability of drawing a red ball becomes 1/2. Find the original number of red and blue balls in the bag.

A 5 and 7
B 10 and 12
C 12 and 8
D 18 and 20
E None of these
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