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At a high school, 84 students play video games during their free time, 129 students ride
skateboards, and 43 students play video games and ride the skateboard. How many students
engage in at least one of these activities in their free time? (Enter your answer in the box below).

Ask by Weston Vargas. in the United States
Mar 29,2025

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170 students engage in at least one of these activities in their free time.

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The Deep Dive

To find the number of students who engage in at least one of these activities, we can use the principle of inclusion-exclusion.
We have:
  • Students who play video games (A) = 84
  • Students who ride skateboards (B) = 129
  • Students who both play video games and ride skateboards (A ∩ B) = 43
Using the formula:
|A ∪ B| = |A| + |B| - |A ∩ B|
Substituting the values:
|A ∪ B| = 84 + 129 - 43 = 170
So, 170 students engage in at least one of these activities.

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