Chris mixed 3 pounds of raisins with 4 pounds of nuts. If a pound of nuts costs 3 times as much as a pound of raisins, then the total cost of the raisins was what fraction of the total cost of the mixture?
-
A\frac{3}{7}
-
B\frac{1}{3}
-
C\frac{1}{4}
-
D\frac{1}{5}
-
E\frac{1}{7}
显示答案
正确答案: D