20.5555555 Degrees Celsius.
To convert from C to F, multiply the C temperature by 9/5 and then add 32: -40oC = (9/5 x -40) + 32 = -72 + 32 = -40oF
You would subtract 32 then multiply by 5/9Example: (100 F - 32)*5/968*5/9=68+5/9=340/9=37.8 C
f=(c*1.8)+32 =(38.2*1.8)+32 =68.76+32 =100.76 ~101f
To convert a value in degrees fahrenheit to celsius, subtract 32 then divide by 1.8