Question

A and b can complete a work in 15 days and B amd C complete the same work in 12 days and C and A complete the same work in 10days.In how many days a can alone done the work?

Answer 1

A +B=1/15
B+C=1/12
C+A=1/10
(A+B)+(C+A)-B+C = 1/15 +1/12-1/10
2A =1/20
A=1/40
A can work 40 days to complete the work