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Which of the following is a non-proportional relationship?

There are 24 students per teacher.
There are 50 apple trees in 1 square mile.
A swimming pool costs $9 per day of use plus a registration fee $12.
There are 10 fish in each fish tank.

User Kefren
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1 Answer

4 votes
the swimming pool is different from the others
User Zhuguowei
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