Question

a and b can together finish a work in 30 days. they worked together for 20 days and then b left . after another 20 days , a finish the remaining work. in how many days a aolne can finish the job

Answer 1

total work = a+b can finish work * their total efficiencies
work= 30*(1+1)
w= 60
a alone can work for (total work/a's efficiency)
60/1=60 days