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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问题 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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答案20 minutes

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

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