tinman1412 wrote:
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 38 grams of protein daily, how many grams of food X are in the mixture.
A. 100
B. 140
C. 150
D. 160
E. 200
1.) x+y = 300 --> x = 300-y plug in the second equation
2.) .10x+.15y = 38
.10(300-y )+.15y = 38
y = 160 hence x is 140
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