问一道GMAT数学题
onarecenttrip,cindydrovehercar290miles,roundedtothenearest10miles,andused12gallonsofgasoline,roundedtothenearestgallon.theactualnumberofmilespergallonthatcindy'scargotonthistripmusthavebeenbetween.
285/12.5and295/11.5
整个题目都看不懂,