Question

The high temperature in a mountain city was 15c. What was the high temperature in degrees Fahrenheit full work

Answer 1

The quick way to estimate this is to double the centigrade temperature and add 30 

F = 2*15 + 30
F = 30 + 30
F = 60

Now let's do it properly
The formula is 
F = (9/5)C + 32
F = (9/5)*15 + 32
F = 135/5 + 32
F = 27 + 32
F = 59 <<<< answer.

Answer 2

59 degrees Fahrenheit