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There is a first-year math exam question: (), 9, (), 12, (), () What's in the brackets?
Attention, everyone, this is a math exam for the first grade. Did you learn decimals in the first grade?

This is an open question. 1, 3,5 has many answers.

(), 9, (), 12, (), (15) Note: The difference between 2, 4 and 6 is 3 respectively.

(8), 9, (1 1), 12, (14), () Note: 1, 3, 5 differ by 3 respectively.

Or: (2), 9, (4), 12, (6), () Note: 1, 3, 5 differ by 2 respectively, not necessarily in a certain order.