Question

9. A and B together can
do a work in 25 days. Calone can do it in 15 days. They worked together
for 6 days and then C leaves off. In how many days will the remaining work be finished by A
and B?​

Answer 1

15 days 15 / 25 = 3/5 = job done. Balance was 2/5 job and was finished by A in 29 days .

1 job will be completed by A in 29/(2/5) = 72.5 days.

A and B can do 1/25 job per day

A can do 2/ 145 job per day by

So B can do (1/25 ) - (2/145) = 1/38.1578946666

For 1 job he needs = 38.2 days