Question

A can do piece of work in 15 days b can do in 12 days andc can do it in 8 days if they start work together and a leave 2 days after and b 2 days before completionthen in how many da6s work is finished

Answer 1

Total work = 48 unit

efficiency of a+b =4 ————-(1)

efficiency of b+c =3 ————-(2)

According to question

5a +7b +13c = 48

now using 1 and 2 equation

5a+ 7(4-a) +13(a-1) =48

11a =33

a=3 , b =1 , c = 2

Time taken by C = 48/2 =24 days