129. On a recent trip, Cindy drove her car 290 miles, rounded to the nestest 10 miles, and used 12 gallons of gasoline, rounded to the nestest 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 答案是D. 不知道题目什么意思，特别是rounded to the nestest 10 miles和rounded to the nestest gallon。麻烦大家帮忙解释一下。 | 
