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

x,y,z do work in 8 days
x,z in 12 days
 so y do this work in 16 days