The food in a camp lasts for 40 men for 20 days. If 10 more men join, how many days will the food last?
Choose the correct option:
A) 22 days
B) 30 days
C) 23 days
D) 16 days
E) 17 days

Rationale: one man can consume the same food in 40 * 20 = 800 days . 10 more men join , the total number of men = 50 the number of days the food will last = 800 / 50 = 16 days . answer : d
Answer: D