13. A rainstorm increased the amount of water stored in State J reservoirs from 124 billion gallons to 138 billion gallons. If the storm increased the amount of water in the reservoirs to 82 percent of total capacity, approximately how many billion gallons of water were the reservoirs short of total capacity prior to the storm?
(A) 9 (B) 14 (C) 25
(D) 30 (E) 44
答案:E
13. The present ratio of students to teachers at a certain school is 30 to 1. If the student enrollment were to increase by 50 students and the number of teachers were to increase by 5, the ratio of students to teachers would then be 25 to 1. What is the present number of teachers ?
(A) 5
(B) 8
(C) 10
(D) 12
(E) 15
答案:E
S/T=30/1, 1.5S/1.05T=25/1, 我列这两个式子好象不对啊.?作者: 漫步雨中 时间: 2003-2-26 16:53
你想要帮什么忙呢？作者: joywzy 时间: 2003-2-26 17:26
有什么需要的，请直说无妨。作者: joywzy 时间: 2003-2-26 17:45
这两题都是我题意理解不清，更可恶的是第2题，看错了，这是我的坏毛病。不知怎么改？
谢谢liangqi。
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