The mean temperature for the first 4 days in January was -7°C. The mean temperature for the first 5 days in January was -5°C. What was the temperature on the 5th day?
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total temperature of first four days is=(-7°×4)=-28°C
total temperature of first five days is (-5×5)℃=-25℃
Temperature of fifth day is (-25℃+28℃)
=3℃
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