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[" 13.certain quantity of watter cools f...

[" 13.certain quantity of watter cools from "70^(@)C" to "60^(@)C" in the first "5" minutes and to "54^(@)C" in the next "],[5" minutes.The temperature of the surroundings is "],[[" (1) "45^(@)C," (2) "20^(@)C," (3) "42^(@)C," (4) "10^(@)C]]

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