看起来这题很简单,搜过都没有人问的,但我就是算来算去就是算不出来,麻烦各位指点。
GWD18-Q24:
The positive numbers w, x, y, and z are such that x is 20 percent greater than y, y is 20 percent greater than z, and w is 20 percent less than x. What percent greater than z is w ?
A. 15.2%
B. 16.0%
C. 20.0%
D. 23.2%
E. 24.8%
Answer:A
写了一大堆算式 没发出去 简单说吧
What percent greater than z is w ? 的意思是 w-z比z大多少百分比, 就是 (w-z)/z 是多少
x=1.2y,y=1.2z,w=80%x
then 1.2*1.2z=w/0.8
w=1.152z
(w-z)/z=15.2%
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