The food in a camp lasts for 10 men for 50 days. If 10 more men join, how many days will the food last?  Choose the correct option:
A) 22 days
B) 25 days
C) 50 days
D) 16 days
E) 17 days

Rationale: "one man can consume the same food in 10 * 50 = 500 days . 10 more men join , the total number of men = 20 the number of days the food will last = 500 / 20 = 25 days . answer : b"
Answer: B