The answer is:
19 ≤ w
Work/explanation:
Let w be the number. Now, let's write an inequality to solve for w.
Let's focus on the part that says "at most a number". At most means that the number can't be greater than something, it can only be less than. So the symbol for "at most" is ≤, which also means "less than".
Now, decreased by 7 means we subtract 7 from w.
With all this information, we are ready to write the inequality.
The inequality is:

Now, let's solve it for w.
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Add 7 on each side


Hence, the answer is 19 ≤ w.