Answer:
Ratio of student who signed up for art club:
1/5
Ratio who signed other club:
4/5
Explanation:
First find out ratio who signed up for art club
you have 16 out of 80
find the common factor: 16
16/16 = 1
80/16 = 5
so 1/5
other clubs is the rest so 5/5 - 1/5 = 4/5
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