Question

A and b can do a work in 72 days, b and c can do it in 120 days, a amd c ca do it in 90 days. in what time can a alone finish the work

Answer 1

a+b=72
b+c=120
a+c=90
lcm is 360
efficiency is a+b=5, b+c=3, a+c=4
2(a+b+c)=12
a+b+c=6
a=6-3=3
so 360/3=120 days for a
please mark it as a brainliest answer