DRDO Multi tasking staff Model paper 3

150 men can last for 30 days
1 man can last for = 30 × 150 days
After 5 days; food left = 4500 - 5 × 150 = 3750 units
Total number of men = 150 - 25 = 125
125 soldiers can last for = (3750/125) = 30 days
Total number of days for which the total supplies lasted = 30 + 5 = 35
Number of days food lasted if 25 people left on first day = (150 × 30)/125 = 36
Difference = 36 - 35 = 1