Temperature at 9 a.m. = 13.6 degree Celsius.
Temperature at 9 p.m. = 6.4 degree Celsius.
Change in temperature = Temperature at 9 a.m.-Temperature at 9 p.m.
Change in temperature = 13.6 - 6.4 = 7.2
So the drop in temperature is 7.2 degree Celsius.
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