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 47 grams of protein daily, how many grams of food X are in the mixture? Choices
A) 240 B) 260 C) 280 D) 300 E) 320
Let x be the number of grams of food X in the mixture.   0.1x + 0.15(400-x) = 47   0.05x = 13   x = 260   The answer is 260.
<result>B</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 47 grams of protein daily, how many grams of food X are in the mixture?