To find out how many students attend Coast Middle School, you can set up a proportion based on the information given:
84 (students who rode bicycles) is 60% of the total number of students at the school, represented as x.
So, you can write the proportion as:
84 / x = 60 / 100
To solve for x (the total number of students at the school), cross-multiply:
84 * 100 = 60 * x
8400 = 60x
Now, divide both sides by 60 to find x:
x = 8400 / 60
x = 140
So, there are 140 students attending Coast Middle School.