单选题If a/b = 6/7 and a/c = 2/5, what is the value of 3b + c in terms of a?A12aB9aC8aD6aE4a

单选题
If a/b = 6/7 and a/c = 2/5, what is the value of 3b + c in terms of a?
A

12a

B

9a

C

8a

D

6a

E

4a

参考解析

解析：
If a/b = 6/7, then 6b = 7a, so 3b = (7/2)a. If a/c = 2/5, then 2c = 5a, so c = (5/2)a.
Hence, 3b + c = (7/2)a + (5/2)a = (12/2)a = 6a

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