RRB NTPC CBT I 10 Jan 2021 Shift 2 Paper

Question : 7 of 100

Marks: +1, -0

3 men and 3 boys can do a piece of work in 10 days. When one man is replaced by a boy, the work is completed in 12 days. In how many days will 2 men and 2 boys complete the work?