Question

A and b together finish work in 12 days b and c finishes it in 15 days c and a in 20 days then b alone can cop

Answer 1

Answer:

A+B =12     5        LCM OF 12,15,20=60

B+C=15       4

C+A=20      3

2(A+B+C)=12

A+B+C=6

1DAY WORK OF A+B+C=60/6=10DAY

A+B+C=10   2              LCM OF 10,20=20

C+A=20       1

B's work alone=20/1=20days