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Mathematics, 17.03.2020 05:53 devin030505

A high school janitor has 140 keys on his key chain. Of these 140 keys, 100 open classroom doors, 80 open the
door to the teachers' lounge, and 60 open classroom doors and the teachers' lounge.

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A high school janitor has 140 keys on his key chain. Of these 140 keys, 100 open classroom doors, 80...
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