30 pens are there in a box where 9 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.
Probability of getting a blue pen , => p/30 = 1/2 => p = 15 So, number of black pens = 30 – 15 – 9 = 6 Required ratio = 15 : 6 = 5:2
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