Bilal can do a work in 15 days and Jalal in 12 days. If they work on it together

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Question

Bilal can do a work in 15 days and Jalal in 12 days. If they work on it together for 4 days, the fraction of work that is left is________?

Options:

A . 3/5

B . 4/7

C . 2/5

D . 1/4

Answer: Option C
PART OF WORK COMPLETED BY BILAL IN A DAY = 1/15 PART OF WORK COMPLETED BY JALAL IN A DAY = 1/12 PART OF WORK COMPLETED BY THEM IN A DAY = (1/15)+(1/12) = 3/20 PART OF WORK COMPLETED BY THEM IN 4 DAYS = (3/20)*4 = 3/5 FRACTION OF WORK LEFT
= 1-(3/5)
= 2/5

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