Question

A can do work in 10 days while B can do the work in 15 days when will they finish the work together ​

Answer 1

For this we have to take the LCM

(10,15) = 30

A= 30÷10 = 3 units a day

B= 30÷15 = 2 units a day

A+B = 5 units a day

So,

15/5 = 3 days

HOPE THIS HELPS

Answer 2

Consider X work given to A & when B is given with (2/3) of A’s work so they will finish in same time.