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[" 15.A liquid cools from "50^(@)C" to "...

[" 15.A liquid cools from "50^(@)C" to "45^(@)C" in "5" min and from "],[45^(@)C" to "41.5^(@)C" in the next "5min" .The temperature "],[" of the surrounding is "],[[" (a) "27^(@)C," (b) "40.3^(@)C," (c) "23.3^(@)C," (d) "33.3^(@)C]]

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