Jack has 5 cats and 1 dog. If the dog's weight is 3 times the average (arithmetic mean) weight of the cats, then the dog's weight is what fraction of the total weight of all 6 animals?
-
A$$\frac{1}{4}$$
-
B$$\frac{1}{3}$$
-
C$$\frac{3}{8}$$
-
D$$\frac{3}{7}$$
-
E$$\frac{3}{5}$$
显示答案
正确答案: C