How many minutes is it before 12 at noon if 90minutes ago it

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/03 01:18:42

How many minutes is it before 12 at noon if 90minutes ago it was four times as many minutes past 9
a.m.? 求翻译

我觉得应该是这么翻译：
某个时间点的90分钟前,其超出早上9点的分钟数的四倍正好是其距离中午12点前的分钟数,求其距离12点前的分钟数是多少?
那么,可以这么列方程假设这个时间点是X（因为是在12点前,直接先以小时计算）,那么12-X=4（X-1.5-9）求出来的时间点是10.8 （0.8小时就是48分钟）就是10点48分.
10点48分距离中午12点的分钟数是72分钟.

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