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Let's plug in each number and see which one is a solution:
For 11:
24 - 11 < 12
13 < 12 (which is false)
For 12:
24 - 12 < 12
12 < 12 (which is false)
For 13:
24 - 13 < 12
11 < 12 (which is true)
Therefore, the number 13 is the solution to the inequality 24-x<12.