If the average (arithmetic mean) of a and b is 110, and the average of b and c is 160, what is the value of a-c?

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问题 If the average (arithmetic mean) of a and b is 110, and the average of b and c is 160, what is the value of a-c?

选项 A、-220
B、-100
C、100
D、135
E、It cannot be determined from the information given.

答案B

解析 Restate both statements as equations: a+b=220 and b+c=320. Subtract the second equation from the first and you get a+b-b-c=220-320=a-c=-100.

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