Question

A and b can do a job in 25 days.after 15 days of working together , b leaves . if a completed a remaining part of job in 20 days,how long would each take to complete the job seprately

Answer 1

one day work=1/25
for 15 days=15/25=3/5
remaining work=1-3/4=2/5

A finish the 2/5work in 20 days
A/5=10
A=50
1/A+1/B=1/25
1/B=1/25-1/50
B=50

Answer 2

Thank you for asking this question. Here is your answer:

Suppose total work is 1

A=1/15 & B=1/25 for one day work

when both work together

(A+B)= (1/15)+(1/25)=7/60

for 7 days

(7/60)x7=7/15

For remaining work

1-(7/15)=8/15

Answer (8/15)