- UID
- 395955
- 在线时间
- 小时
- 注册时间
- 2008-11-11
- 最后登录
- 1970-1-1
- 主题
- 帖子
- 性别
- 保密
|
1，in a certain state, gasoline stations compute the price per gallon p, in dollars,charged at the pump by adding a 4 percent sales tax to the dealer's price per gallon d , in dollars, and then adding a gasoline tax of $0.18 per gallon. Which of the following gives the dealer's price per gallon d in terms of the price per gallon p charged at the pump?
(1)d=p-0.22 (2) d=p/1.22 (3) d=(p/1.04)-0.18
(4) d=（p-0.18)/1.04 (5)d=(p-0.04)/1.18
答案是（4）
2,at a speed of 50 miles per hour, a certain car uses 1 gallon of gasoline every 30 miles. if the car starts with a full 12 gallon tank of gasoline and travels for 5 hours at 50 miles per hour, the amount of gasoline used would be what fraction of a full tank?
(1)3/25 (2)11/36 (3)7/12 (4)2/3 (5) 25/36
答案是（5)
3. a used-car dealer sold one car at a profit of 25 percent of the dealer's purchase price for that car and another car at a loss of 20 percent of the dealer's purchase price for that car. if the dealer sold each car for $20,000, what was the dealer's total profit or loss, in dollars,for the two trasactions combined?
(1) $1,000 profit (2)$2,000 profit (3) $1,000 loss
(4)$2,000 loss (5) $3,334 loss
答案是（3） ----我想来想去都不明白为什么不是（1）？求大侠指点！
4,when 2/3 of the garments in a shipment were inspected,18 of the garments pass inspection and the remaining 2 garments failed. how many of the uninspected garments must pass inspect in oder that 90 percent of the garments in the shipment pass?
(1)10 (2) 9 (3) 8 (4) 7 (5) 5
答案是（2）
以上4题求具体解法~紧急啊~星期二就考试了~现在真没底~ |
|
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2010-8-15 23:41:10
收藏
收藏
楼主
