Question

2 men and 7 boys can do a piece work in 4 days, the same work is done in 3 days by 4 men and 4 boys. How long would it take one man and one boy to do it.​

Answer 1

Answer:

I hope it will help you...

Answer 2

Answer:

let one boy be X

let one man be y

let one boy and one man complete the work in 1 day be 1/X &1/y respectively

4(2×1/X+7×1/y)=1

3(4×1/X+4×1/y)=1

when reduced

8a+28b=1

12a+12b=1

then solve it by elemination method as given in photos