Question

a can do a certain job in 25 days while B can do it in 20 days a started the work and was joined by b after 10 days in how many days was the whole work completed​

Answer 1

Answer:

The work was done by A in 10 days =10/25=2/5

The remaining work 3/5 completed by A and B together. The number of days required to complete the remaining work =(3/5)/(1/25+1/20)=(3/5)(100/9)=20/3 days.