Question

A can do a peice of work in 14 days which b can do in 21 days. They begin together but 3 days before the completion of the work, a leaves off. The total number of days to complete the work is

Answer 1

TOTAL WORK=42 UNITS

A=3 per day

b=2 per day

A+b=5per day

last three days only B works 3*2=6units

remining 36 units ,both a&b wll complte=36/5 days

total days =36/5+3=10.2days