A diet contains 400 grams of a mixture of two foods, food X and food Y. Food X contains 10 percent protein and food Y contains 15 percent protein. If a diet provides exactly 48 grams of protein daily, how many grams of food X are in the mixture?	Choose the correct choice from the following choices:
A) 200
B) 220
C) 240
D) 260
E) 280
Let x be the number of grams of food X in the mixture.   0.1x + 0.15(400-x) = 48   0.05x = 12   x = 240   The answer is 240.
<result>C</result>
A diet contains 400 grams of a mixture of two foods, food X and food Y. Food X contains 10 percent protein and food Y contains 15 percent protein. If a diet provides exactly 48 grams of protein daily, how many grams of food X are in the mixture?