400-600-1123
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答案：
D
cindy开车的
里数四舍五入到10miles，为290miles，所以她开车的里程数范围为285~295
用的汽油数四舍五入到1gallon，为12gallons，所以她用掉的汽油数范围为11.5~12.5
所以 实际开始每加仑可以开的英里数为 285/12.5~295/11.5之间
注意用最大除最小和最小除最大来求范围 
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