Question

A and b can do work in 12 days b and c in 15 days a and c 10 days if they work for 12 days and b and c left

Answer 1

Answer:

(A+B)'s one day work is 1/12

(B+C)'s one day work is 1/15

(C+A)'s one day work is 1/20

Thus,2(A+B+C)'s one day work is 1/12+1/15+1/20=1/5

so,(A+B+C) can complete the work in 10 days.

(A+B+C)'s one day work=1/10

A 's one day work=1/10-1/15=1/30

B's one day work=1/10-1/20=1/20

C's one day work=1/10-1/12=1/60

The answer option shall be a

However, the answer is given in one day's work.

Otherwise the answer would be 30,20 and 60 days