Question

A and b can together finish work in 30 days .They worked together for 20 days and then b left. After another 20 days, a finished the remaining work .In how many days a alone can finish the job? Select one:
a. 40
b. 54
c. 50
d. 60

Answer 1

Answer:

60

Step-by-step explanation:

a and b did the job in 30 days. in one day, they did 1/30 of the job. in 20 days they did 1/30 * 20 = 2/3 of the job. the remaining 1/3 of the job was completed by a alone in 20 days. so, he would take 20*3 = 60 days to complete the job alone.

Answer 2

Answer:

60

Step-by-step explanation: