Question

A and B can do piece of work 4days and 6 days respectively.If the work together for 2days.what part of the work is left undone?

Answer 1

Let the total work be 12 unit(lcm of both work days)
A work in one day = 3 unit
B= 2 unit
Total of A and B =5 unit
In two days work done by A & B =2*5=10
Remaining = 2 unit
2/12=1/6 part is remaining