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Answer :

We know that Gary's age is 11 years old. So, we just have to use an expression to indicate someone's age.

Let's consider the expression:

[tex]2g+5[/tex]

This expression represents Mr. Smith's age who is 27 years old. Let's prove it using Gary's age.

[tex]2(11)+5=22+5=27[/tex]

Therefore, our expression is 2g + 5.