请教两道Problem Solving Questions
1. On a recent trip, Cindy drove her car 290 miles, rounded to the nearest 10 miles, and used 12 gallons of gasoline, rounded to the nearest gallon. The actual number of miles per gallon that Cindy's car got on this trip must have been betweenA. 290/12.5 and 290/11.5
B. 295/12 and 285/11.5
C. 285/12 and 295/12
D. 285/12.5 and 295/11.5
E. 295/12.5 and 285/11.5
2. The price of lunch for 15 people was $207.00, including a 15 percent gratuity for service. What was the average price per person, EXCLUDING the gratuity?
A. $11.73
B. $12.00
C. $13.80
D. $14.00
E. $15.87 1 miles from 285---295 , gallons from 11.5---12.5
easy to see ba ?
2 207 * (1-15%)/15
you need to imporve your English I think ......
the math here is pretty easy 第一道题我不知道rounded to the nearest是什么意思,还有第一道题的答案是选D。我不明白为什么是走得越少用的油越多,而走得越多反而用的油越少呢?
第二道题我和你的算法一样,得出来的答案是A。但是题目给的正确答案是B。所以才问的,我想也不想你说的那么easy吧。 这个.....
第一题,我也不知道怎么说才好
他问的是最大值和最小值的问题,你想的多了
第二个,如果你那样做,和答案不一样
答案错了 抱歉,呵呵
第二题,刚才在睡觉前想了一下
这个和美国文化有关
我和一些老美去过酒吧
那个 a 15 percent gratuity for service , 就是小费
是这样算的, 你的饭钱 ,比如说是X 那你要付的小费就是 15% * X
所以第二题应该是:
X + 15% * X = 207
you get X = 180
then 180 / 15 = 12 ,
so answer B
hope this helps 非常非常非常感谢,彻底明白了。
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