Answer:
9
Step-by-step explanation:
Let us say, Olivia's age is x.
Now as the question says, we will get this equation.
[tex] ( \frac{1}{3} x ) + 12= 2x - 3[/tex]
Multiply both sides by 3.
[tex]x + 36 = 6x - 9[/tex]
Collect like terms.
[tex]x - 6x = - 9 - 36[/tex]
Calculate.
[tex] - 5x = - 45[/tex]
Divide both sides of the equation by -5.
[tex]x = 9[/tex]
Then, we will get the answer.
I hope it helps.
