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On a recent trip,Cindy drove her car 290 miles,rounded to the nearest 10miles,and used 12 gallons of gasoline,rounded to the nearest gallon.The actual number of miled 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,但是按照四舍五入的原理,所有答案中都应该是12.4,而不是12.5,答案有问题怎么办呢? |
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