5. A, B and C together can complete a

piece of work in 10 days. All the three

started working at it together and after

4 days ‘A’ left. Then B and C together

completed the work in 10 more days.

‘A’ alone can complete the work in

# 5. A, B and C together can complete a

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Answer:(a+b+c) do work in 10 days

so,( a+b+c)’s work =1÷10 and as they work together for 4 days so work done by them in 4 days = 4÷10 =2÷5

remaining work = 1+2÷5

(b+c) take 10 more days to complete 3÷5 work

so, (b+c)’s 1 day work =3÷5

now A’s 1 day work = 1÷10 – 3÷5 = 1÷25

A does 1÷25 work in 1 day

therefore, A can complete 1 work in 25 day