Question

A and b together complete job in 8days b alone done in 12days if b worked for 4 days

Answer 1

1 day work of b = 1/12

1 day work of a+b together = 1/8

1 day work of a = 1/8 - 1/12

= 1/24

A can do the work alone in 24 days

b worked for 4 days so work done be b = 4/12 = 1/3

remaining work = 1 - 1/3 = 2/3

2/3 work has to be completed by a

so 2/3 of 24 = 16

a will complete the remaining work in 16 days