Question

A,B and C can do a work in 12, 24 and 8 days. They all work for one day. Then C leaves the group. In how many days will A and B complete the rest of the work

Answer 1

just divide A and B
 

Answer 2

work done by A in one day=1/12
work done by B in one day=1/24
work done by C in one day=1/8
•work done by A,B and C in one day=1/12+1/24+1/8
=(2+1+3)/24=6/24=1/4
they work together for one day then C leaves
•amount of work left=1-1/4=(4-1)/4=3/4
•work done by A and B in one day=1/12+1/24
=3/24=1/8
the rest of work is sent in the picture