Question

If 5 men can do a piece of work in 20 days, in
how many days will 10 men and 5 boys do
the same work if 1 man does as much work as
2 boys ?
(A) 8
(B) 10
(C) 12
(D) 36
(E) None of these​

Answer 1

in 5 man = 20 days

so,

in 1 man =. 20/5 = 4

thus,

then 2 man s = 4×2 = 8 days