Question

A bag contains a certain number of balls of different colors. The ratio of the number of black-colored balls to white-colored balls is 5:7, respectively, and the ratio of the number of white-colored balls to red-colored balls is 7:6, respectively. Find the total number of red-colored balls if the total number of black-colored balls in the bag is 15.

A 25
B 65
C 150
D 18
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