Question

7 A and B can reap a field in 30 days, working together. After 20 days, however, B is called away and A takes 20 days more to complete the work. B alone could do the whole work in​

Answer 1

Step-by-step explanation:

(A+B)30 = (A+B)20 + 20A

30A+30B = 20A+20B +20A

10A = 10B

A : B

1 : 1

TW = (1+1)30 = 60

time= 60/1 = 60 days