Question

Mr. Andade had supply bag with three mechanical pencils, four blue pens, and five black pens. If he selects a writing utensil without looking, what is the probability he will select a mechanical pencil?

Answer 1

1/6

Explanation:

The sum of all writing utensils are 3+4+5 = 12,

Therefore the probability he will select a mechanical pencil is 3/12 or 1/4.

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For additional info,

Probability of selecting a blue pen and black pen respectively is 4/12 or 1/3 and 5/12.