Question

A,Band C together can do a work in 8 days if A and B can do it in 20 and 30 days respectively then in how many days C alone can complete it?

Answer 1

Answer:

Step-by-step explanation:

Given,

A,B,C can do work in 8 days.

A alone can finish it in 20 days​

In one day the work done by A and B respectively is1/20&1/30

So,

1/20+1/30+k is equal to 1/8

30+20/600+k=1/8

50/600-1/8= -k

1/12-1/8= -k

-4/96=-k

-1/28=-k

28=k

Therefore C alone can finish the work in 28 days

Answer 2

Answer:

C can do work in = 24 days