Question

a garrison of 1600 men has provision for 25 days. how long will the provisions last if the garrison is increased by 400 men.​

Answer 1

1600 + 400 = 2000

1600 men can eat the food in 25 days

1 men can eat the food in 25 × 1600 days

2000 men can eat the food

= 25 × 1600 ÷ 2000 = 20 days