Question

sat数学题：（在线等）

p832.8 the price of ground coffee beans is d dollars for 8 ounces and each ounce makes c cups of brewed coffee. In terms of c and d, what is the dollar cost of the ground coffee beans required to make 1cup of brewed coffee? (用字母表示）
我觉得是8c/d啊，貌似不对，可能是题目理解的问题，拜托大虾帮忙。感谢。

Answer 1

一盎司咖啡豆可以磨c杯咖啡，则一杯咖啡需要1/c盎司咖啡豆，一盎司咖啡豆价值d/8美元，则1/c盎司咖啡豆要d/(8c)美元，即一杯咖啡需要d/(8c)美元

追问

另还有一道，If there is no waste , how many square yards of carpeting is needed to cover a rectangular floor that is 12 feet by 18feet?(1yard=3feet) 我一开始理解的是“（把square理解成正方形）多大的正方形能正好覆盖过来一个12乘18的长方形”但貌似题目不是这个意思啊，有什么办法能正确把握题目意思呢？？

Answer 2

Answer:
1.) Coffee Problem:
For d dollars, you make 8c cups of coffee. So each cup of coffee costs d/(8c) dollars.

2.) Carpeting Problem:
"Square yard" means “平方码”. So 12 feet by 18 feet means (12/3) yards by (18/3) yards, or 4 yards by 6 yards, which is 4x6 = 24 square yards.

Answer 3

d/8c

追问

怎么理解的呢

追答

8盎司d元，每盎司d/8元，每盎司冲c杯，最后问一杯的成本是多少，那不是d/8c？？

追问

谢谢啊，另还有一道，麻烦了麻烦了：If there is no waste , how many square yards of carpeting is needed to cover a rectangular floor that is 12 feet by 18feet?(1yard=3feet)

追答

24