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