# Question d581a

Feb 16, 2018

40% of the class passed the biology test

#### Explanation:

We can write a fraction to represent how many students passed.

There are $45$ students in total but only $18$ out of $45$ students passed. The key phrase there was "out of"

The phrase $18$ "out of" $45$ can be mathematically expressed as

$\frac{18}{45}$

This results in a decimal, $0.4$ but we want to know what percentage of the students passed. To find this percentage, we multiply the decimal by $100$ and add a % sign.

Therefore,

0.4*100%=40%

So we can conclude that 40% of the class passed the biology test which also means 60%# did not.