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-20 is the colder reading. With negative numbers, the further away from zero you go - the greater the value of the number.
A change in the reading of a thermometer from -20 to -10 degrees represents a rise in temperature of 10 degrees. Another way to say this is that the temperature changed by +10 degrees.
19 out of 20 = 0.9519/20:= 19 ÷ 20= 0.95 in decimal
20 - 19 = 1
100*(39-20)/20 = 100*19/20 = 95%100*(39-20)/20 = 100*19/20 = 95%100*(39-20)/20 = 100*19/20 = 95%100*(39-20)/20 = 100*19/20 = 95%
19 is greater than -20.