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1 Answer
Anthony R.
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

#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.

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