Aaron notes that 10% of his class is absent. If the class has 20 students, how many are absent?

2 Answers
Nov 27, 2016

2 students are absent

Explanation:

The amount of students that are absent is 10% of the whole class which has 20 students in it.

So

absent students=10%(20)
=0.1(20)=2

Nov 28, 2016

2

Explanation:

color(blue)("First principle method")

The % sign is a unit of measurement that is worth 1/100 of whatever you are considering.

We are considering a complete class of count 20

So we need to calculate

10%" of "20" " ->" " 10%xx20" "->" "10/100xx20

=200/100 = (2xxcancel(100)^1)/(cancel(100)^1) = 2
~~~~~~~~~~~~~~~~~~~~~~~~~~
color(blue)("Shortcut method")

Known that 10% = 1/10 so we have 20/10 = 2