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 the sun do it alone

Answer 1

Answer:

let, man=A and son=B

A=5d and A+B=3d

B=?

we now that,

time and work are inversely propertinal

i.e: A=2 days so A's work is 1/2

now , A=1/5 and A+B=1/3

use, A+B = A+B

1. 1/5+1/x=1/3

2. 1/x=2/15

3. 2x=15

4. x= 7 1/2 or 7.5

Answer 2

Answer:

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