總共兩題計量 必須看下圖
http://i.imgur.com/oyLpBGS.jpg
1. The time period during which the actual water level was lower than the
drought warning water level was approximately what fraction of the one-year
period shown?
(A) 1/6 (B) 1/5 (C) 7/24 (D) 3/8 (E) 5/12
請問這題是不是在問actual water level低於drought warning water level的時間
佔了一整年的比例?
如果是的話 Dec 1~Jan 1 以及 Jan 1~Feb 1 這兩個區間都滿足
所以我的答案是2/12=1/6選A 但答案為何是C ?
2. On which of the following days did the drought warning water level
exceed the drought emergency water level by the greatest percent?
(A) March 1, 2000 (B) June 1, 2000 (C) August 1, 2000
(D) November 1, 2000 (E) February 1, 2001
題目是不是在問下列哪天drought warning water level超過drought emergency
water level的比例最多?
我看選項中的日子，warning level大約都比emergency level大了30 billions of
gallons，因此我選了D的November 1, 2000
因為在都是多了30的情況下，emergency level越低，代表漲的percent會越大
比方說A的薪水是四萬 B的薪水是兩萬 兩人同樣加薪加了一萬
則B的漲幅的percent會大於A
請問我的想法錯在哪