Question

20 pens are there in a box where 8 are red pens, ‘p’ are blue pens and remaining are black pens. If a pen is picked, the probability of getting blue pen is 0.5. Find the ratio of the number of blue pens and black pens.

A 5:2
B 3:5
C 6:7
D 5:1
E None of these
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