Here’s a simpler way to think about converting Fahrenheit to Celsius:
C=(F−32)×0.56C = (F – 32) \times 0.56
For 105∘F105^\circ F:
C=(105−32)×0.56=73×0.56=40.88∘CC = (105 – 32) \times 0.56 = 73 \times 0.56 = 40.88^\circ C
So, 105°F is about 40.9°C.