GMAT考试

【单选题】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
A、-220
B、-100
C、100
D、135
E、It cannot be determined from the information given.

网考网参考答案：B
网考网解析：
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. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>