问答题How many minutes is it before 12 noon if 90 minutes ago it was four times as many minutes past 9 am?
问答题
How many minutes is it before 12 noon if 90 minutes ago it was four times as many minutes past 9 am?
参考解析
解析：
设是中午12点以前x分钟。根据题意可得此方程式：
x=4[12×60－(90+x)－9×60]
解得x=72
设是中午12点以前x分钟。根据题意可得此方程式：
x=4[12×60－(90+x)－9×60]
解得x=72
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