Question

A does a work in 10 days, B in 15 days, and C in 20 days. A and C worked together for two days, after which B started to work. How long will the entire work be done?​

Answer 1

lcm of total three 60

now eff of a is 6

eff b of is 4

eff of c is 3

a and c work together 9*2=18 remaining work 60-18=42

42/3