A young boy can complete a project in 25 days while his father and grandfather take 15 and 20 days respectively to finish the same task. If all three of them work together on the project, how long will they take to finish it?

A young boy can complete a project in 25 days while his father and gr

1.	A young boy can complete a project in 25 days while his father and grandfather take 15 and 20 days respectively to finish the same task. If all three of them work together on the project, how long will they take to finish it?
A.	6.5 Days
B.	7 Days
C.	7.5 Days
D.	8 days
Answer» D. 8 days

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A young boy can complete a project in 25 days while his father and grandfather take 15 and 20 days respectively to finish the same task. If all three of them work together on the project, how long will they take to finish it?

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