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If the average (arithmetic mean) of a and b is 110, and the average of b and c i
If the average (arithmetic mean) of a and b is 110, and the average of b and c i
游客
2024-01-14
11
管理
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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