Question 77

A, B and C can finish a job working alone in 72, 24 and 36 days respectively. In how many days they can finish the job if they worked together?

Solution

Let total work = LCM of 72, 24 & 36 = 72 units

Efficiency of A = 72/72 = 1

Efficiency of B = 72/24 = 3

Efficiency of C = 72/36 = 2

All 3 together can complete the work in 72/(1+3+2) = 72/(6) = 12 days

So the answer is option A.

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