Let the number of students in each region of the Venn diagram be:

To solve this problem, we will use a Venn diagram approach. Let F represent Football, N represent Netball, and B represent Basketball.
Let the number of students in each region of the Venn diagram be:

• $a$: Football only
• $b$: Netball only
• $c$: Basketball only
• $d$: Football and Netball only (not Basketball)
• $e$: Football and Basketball only (not Netball)
• $f$: Netball and Basketball only (not Football)
• $g$: Football, Netball, and Basketball (all three)
• $h$: None of the three sports

We are given the following information:
Total students = 85.

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