# A certain freezing process requires that the room temperature be lowered from 20°cat the rate of 2.5°c per hour.find the tempetature of the room after 5 hours.

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by son3

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by son3

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its decreasing rate= 2.5°c per hour.

its temperature decreased after 5 hours= 2.5*5= 12.5°c

temperature after 5 hours= 20-12.5= 7.5°c.