2. 职称英语
  3. If the average (arithmetic mean) of x and y is 40, and z-x=60, what is the avera

If the average (arithmetic mean) of x and y is 40, and z-x=60, what is the avera

游客2024-01-14  51
问题 If the average (arithmetic mean) of x and y is 40, and z-x=60, what is the average of y and z?
选项 A、20
B、50
C、65
D、70
E、140
答案 D
解析 To get the average of y and z, you need to find half of the sum of y+ z. To obtain that number, first restate the first statement as an equation: x+y=80. Add that equation to z-x=60, so that x+y+z-x=80+60=y+z=140. The average of y and z is 140/2=70.
转载请注明原文地址:https://www.tihaiku.com/zcyy/3360463.html
相关试题推荐
随机试题
最新回复(0)