Question

A can do a piece of work in 12 days and B in 15 days. They work together for 5 days and then B left. The days taken by A to finish the remaining work is: 

(a) 3 

(b) 5 

(c) 10 

(d) 121

Answer 1

Correct option (a) 3

Explanation: 

(A+B)’s one day work = 5+4= 9 units

(A+B)’s 5 days work = 9×5=45 units

Work left = 60-45 = 15 units

A completes the remaining work in =