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To find out which number is a solution of the inequality, we can substitute each number into the inequality and see if it is satisfied.
Let's start with 11:
24 - 11 < 12
13 < 12
This is not true, so 11 is not a solution.
Next, let's try 12:
24 - 12 < 12
12 < 12
This is also not true, so 12 is not a solution.
Finally, let's try 13:
24 - 13 < 12
11 < 12
This is true, so 13 is a solution.
Therefore, the number 13 is the solution to the inequality 24 - x < 12.