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 49 grams of protein daily, how many grams of food X are in the mixture?
Pick one
A) 160
B) 180
C) 200
D) 220
E) 240
Let x be the number of grams of food X in the mixture.   0.1x + 0.15(400-x) = 49   0.05x = 11   x = 220   The answer is 220.
<result>D</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 49 grams of protein daily, how many grams of food X are in the mixture?