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 between
A. 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
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？
第二道题我的算法是207 * (1-15%)/15
，得出来的答案是A。但是题目给的正确答案是B。请大家给我讲讲，谢谢！
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