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2016-05-03T12:16:13+05:30

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Temperature falls at the rate of 2/5 = 0.4 ⁰ per day means that the temperature reduces by an amount of 0.4⁰ each day.

From 1st day to the 5th day, (during 4 days) the temperature falls by 4 * 0.4⁰.

so the temperature on the 5th day = 20⁰ - 4 * 0.4⁰ = 18.4⁰.

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