GRE考试

【单选题】The average of x and y is 16 and the average of x, y, and z is 22. What is the value of z
A、16
B、22
C、34
D、45
E、66
网考网参考答案：C
网考网解析：
You are given that the average of x and y is 16. Therefore, (x+y)÷2=16, which means that x+y=32. It is not important to know what x and y equal individually, only to know that their sum is 32. Given that the average of x, y, and z is 22, then (x+y+z)÷3=22, and x+y+z=66. Since x+y=32, then 32+z=66, and z=34. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>