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A man can do a piece of work in 5 days, ...

A man can do a piece of work in 5 days, but with the help of his son he can do the same work in 3 days. In what time can the son do it alone?

A

`6 1/2 ` days

B

7 days

C

`7 1/2 ` days

D

8 days

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The correct Answer is:
C
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