# 40% of what number is 108?

Apr 12, 2016

You must write a proportion.

#### Explanation:

$\frac{108}{x} = \frac{40}{100}$

$x = \frac{108 \times 100}{40}$

$x = 270$

40% of 270 is 108.

Practice exercises:

Below is the graph of average temperatures by month in Flagstaff, Arizona. Find the percentage of months where the nighttime temperature is less than 40˚ F

Good luck!