RRB Group-D Model Paper 18 with answers for online practice

A’s work in 1 day = 1/20
B’s work in 1 day = 1/50
A and B’s work in 1 day = (1/20) + (1/50) = (5 + 2)/100 = 7/100
∴ 1 day’s work = 7/100
⇒ 5 days’ work = 5 × (7/100) = 35/100
∴ Work left to do = 1 – (35/100) = 65/100 = 13/20