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| Application of sets |
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| Example: |
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| In a class of 80 boys, there are 60 boys who play
rugby and 35 play tennis. Use Venn diagrams to show how many boys play both the games? How many play
rugby only and how many play tennis only? |
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| Suggested answer: |
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| Let n(R) = number of boys of who play
rugby |
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| n(T) = number of boys who play tennis |
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| Let x = number of boys who play both the games |
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| From the above diagram it is clear that, |
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| Those who play rugby only = 60 - x = 60 - 15 = 45 |
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| Those who play tennis only = 35 - 15 = 20 |
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| To find: |
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