Question

The daily absentee rate for the entire 7th grade class is 7.5%. If 9 students were absent Thursday, how many students are in the 7th grade class? *

Answer 1

Step 1: Assign variable for the unknown that we need to find.

Let x be the number of students in 7th grade.

Step 2: Using the given statement we need to set up an equation.

7.5% of number of students in 7th grade are absent. 9 students are absent.

$7.5\% \; of \; x = 9\\\\\frac{7.5}{100} \ttimes x=9\\\\0.075x=9\\Divide \; by \; 0.075\; on\; both \; sides\\\\ \frac{0.075x}{0.075}= \frac{9}{0.075} \\Simplify \; the \; fraction \; both \; sides\\\\ x=120$

Conclusion:

There are 120 students in 7th Grade

Answer 2

There are 120 students because

100/7.5 = 13.333333

and 9 x 13.333333 = 120