Question

A,B,C can do a work in 30,25,28 days respectively. A and B started the work together,after 5 days B left the work and C joined.Then how many days will take to complete this work.​

Answer 1

total work =2100

A can do in one day =2100/30

= 70

B can do in one day =2100/25

=84

c can do in one day =2100/28

=75

A+B work for 5 days =5×(70+84)

=770

remaining work= 2100-770

=1330

A+C one day work= 70+75

=145

so that remaining work will be done in =1330/145

=9.17 days