According to Fahrenheit to Celsius Conversion formula if you want to convert 100 (one hundred) degrees Fahrenheit (掳F) to degrees Celsius (掳C) you he to subtract 32 from 100 and then multiply by 5/9. (multiplication by 5/9 means that you can first multiply by 5 and then divide by 9).
Here is the complete solution:
((100 - 32) 脳 5) 梅 9
=(68 脳 5) 梅 9
=340 梅 9
=37.78
(thirty-seven point seven eight degrees Celsius )