Certain quantity of food is sufficient for certain number of men for 13 days. After 1 day 2/5 of them desert how long will the food now last?
Q1. Certain quantity of food is sufficient for certain number of men for 13 days. After 1 day 2/5 of them desert how long will the food now last?
Answer: 20 days
Explanation: After 1 day, food remains for 12n man-days; 2/5 desert leaving 3n/5 men; remaining days = 12n ÷ (3n/5) = 20 days.