the food in a camp lasts for 20 men for 50 days . if 20 more men join , how many days will the food last ? Choose the correct choice from the following.
A) 22 days  B) 25 days  C) 28 days  D) 16 days  E) 27 days

Rationale: one man can consume the same food in 20 * 50 = 1000 days . 20 more men join , the total number of men = 40 the number of days the food will last = 1000 / 40 = 25 days . answer : b
Answer: B