Question

a man can do a piece of work in 5 days but with the help of his son he can do it in 3 days in what time can the sun do it alone?
Prove?

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

7.5 days

Step-by-step explanation:

A man can do full work in 5 days.

He completes 1/5 in one day and

• 3*1/5=3/5 of work in 3 days

His son completes remaining part of work:

• 1-3/5=2/5 in 3 days

So the son completes

• 1/3*2/5=2/15 of work in one day

The son can full work alone in

• 1 ÷ 2/15= 15/2= 7.5 days

Answer: The son needs 7.5 days to do work