Question 578357
{{{0^o}}} Celsius is the freezing temperature of water (equal to {{{32^o}}} Fahrenheit). Susan should pack plenty of warm clothing, gloves, and hats.
The boiling point of water is {{{100^o}}} Celsius and {{{212^o}}} Fahrenheit.
So a temperature difference of {{{100^o}}} Celsius is equivalent to a temperature difference of {{{180^o}}} Fahrenheit. To convert from one temperature to the other
you can calculate degrees above freezing on one scale and apply the ratio
{{{180/100=1.8/1=9/5}}} or {{{100/180=5/9}}} (depending on the direction you are converting),
to get degrees above freezing on the other scale.
If the travel agent had said 30 degrees Celsius (that's 30 degrees Celsius above freezing), you could multiply times (9/5) to get 54 degrees Fahrenheit above freezing. Since freezing is 32 degrees Fahrenheit, the temperature reading in degrees Fahrenheit would be {{{32+56=88}}}, and then Susan would be packing shorts.
If Doña María finds that the temperature of her sick baby is 104 degrees Fahrenheit, she should subtract 32 to find that it is 72 degrees Fahrenheit above freezing, before multiplying times 5/9 to find that it is 40 degrees Celsius, and then rushing that baby to the doctor's.
By the way, both temperature scales meet at -40 degrees. If someone tells you the temperature is 40 below, you do not need to ask what scale.