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 37 grams of protein daily, how many grams of food X are in the mixture.
Choose the correct choice from the following options:
A) 100 B) 140 C) 150 D) 160 E) 200
Let x be the amount of food X.   0.1x + 0.15(300-x) = 37   0.05x = 8   x = 160   The answer is 160.
<result>D</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 37 grams of protein daily, how many grams of food X are in the mixture.