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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



The answer is 2.5×5
that's simple as hell?!!
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Present temperature of the room= 20°c
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.
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