Question

X, Y and Z together can do a piece of work in 8 days while X and Z together can do it in 12 days. Y alone will do the same work in a) 16 days b) 20 days c) 24 days d) 28 days

Answer 1

See in this question
3 people are doing the same work in 8 days
so
one person can do the work in
= 3 × 8 = 24 days.
So, Y will do the same work in 24 days....
I guess this the right answer