RRB Group-D Model Paper 20 with answers for online practice

Given:
18 men built a tanker in 25 days
Calculation:
18 men → 25 days
⇒ 1 man → 18 × 25 = 450 days
⇒ 10 men → 450/10 = 45 days
∴ 10 men can build the tanker in 45 days