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Mathematics, 11.03.2021 14:00 nook4boo

A fan consumes 1 unit of electricity in 3 hours. Rahul has 2 fans which consumed 21 units this month. For how many hours did he use the fan this month?

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A fan consumes 1 unit of electricity in 3 hours. Rahul has 2 fans which consumed 21 units this month...
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