Answer: 68°F
The equation is given in the question, 1.8•C+32. Plug c with 20°C, you equation would then look like this. 1.8(20)+32. The next step is very simple, (Remember PEMDAS) multiply first from left to right. Last add 32 to 36 to get you final sum of 68°F. Now thats the perfect temperature for me.