问答题How many minutes before midnight is it if one hour ago it was five times as many minutes past 9 pm?

问答题
How many minutes before midnight is it if one hour ago it was five times as many minutes past 9 pm?

参考解析

解析:
晚9点与午夜12点之间相差3小时,3小时减去1小时为2小时,把2小时平分为6份,可得20分钟。

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