Step-by-step explanation:
the answer that you need to put into the box is 20.5 degrees Celsius.the reasoning for this is because the Red Bar indicating the temperature goes right about 70 degrees Fahrenheit which is a little bit more than 20 degrees Celsius.the red bar is close to 70.5 degrees Fahrenheit which is close to 20.5° C.
therefore the closest half degree of the temperature in celsius 20.5 .