A rabbit on a controlled diet is fed daily 300 grams of a mixture of two foods, food X and food Y. Food X contains 10% protein and food Y contains 15% protein. If the rabbit's diet provides exactly 36 grams of protein daily, how many grams of food X are in the mixture.	Choose the correct choice from the following choices: A) 120 B) 140 C) 150 D) 160 E) 180
Let x be the amount of food X.   0.1x + 0.15(300-x) = 36   0.05x = 9   x = 180   The answer is 180.
<result>E</result>
A rabbit on a controlled diet is fed daily 300 grams of a mixture of two foods, food X and food Y. Food X contains 10% protein and food Y contains 15% protein. If the rabbit's diet provides exactly 36 grams of protein daily, how many grams of food X are in the mixture.