Answer:
The correct answer is:
C. 50
Step-by-step explanation:
To determine the total number of students in the class, given that 40% of the students can ride a roller coaster and that 20 students ride the roller coaster, we can set up the following equation:
Let x be the total number of students in the class.
Given that 40% of the students ride the roller coaster, we can write:
[tex]\[0.40x = 20\]\\Now, solve for x:\[x = \frac{20}{0.40}\]\[x = \frac{20}{0.4}\]\[x = 50\][/tex]
Thus, the total number of students in the class is 50.
Therefore, the correct answer is:
C. 50