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An unknown number decreased by 9 is at most 25. What is the number?

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Final answer:

The unknown number the student is asking about is any value less than or equal to 34, which is found by adding 9 to the maximum value of 25 that the decreased number could be.

Step-by-step explanation:

To solve for the unknown number, we set up an inequality based on the given statement: unknown number decreased by 9 is at most 25. This can be written as:

x - 9 ≤ 25

Add 9 to both sides to isolate x on one side:

x ≤ 25 + 9

x ≤ 34

The unknown number is 34 or any number less than or equal to 34. So, the direct answer in 2 lines is: The unknown number is any value ≤ 34.

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