Question

a and b can together finish a work in 40 days. they worked it for 20 days and then b left. the remaining work was done by a alone in 30 days. a alone can finish the work in ​

Answer 1

1 day's work of a and b=1/40

20 days work of a and b=20/40=1/2

remaining work=1-1/2=1/2

1/2 work was done by a in 30 days

so. a alone can finish the work in 60 days