2012-05-15 09:00:09

If it takes seven pounds of food to feed four dogs for two weeks, how many days will 21 pounds of food last for eight dogs?

(A) 8
(B) 14
(C) 16
(D) 21
(E) 24

The correct answer is D

Explanation: Start by finding out how many pounds of food each dog eats in a day. If four dogs require seven pounds for two weeks, then four dogs eat 1/2 pound of food each day (from seven pounds divided by fourteen days equals 1/2 pound). If there are 8 dogs, then twice that amount of food is needed per day, meaning 8 dogs would require 1 pound of food per day. Thus, 21 pounds of food would last 8 dogs 21 days. This makes choice D correct.