Oliver had $9, then he saved $5 from his allowance and spent $4 on a frisbee and $3 on a puzzle. His friend gives him another $8 as it's his birthday. How much money does Oliver have left?
The total amount of money saved is $9 + $5 = $
<gadget id="calculator">9+5</gadget>
<output>14</output>
14.
The total cost of the frisbee and the puzzle is $4 + $3 = $
<gadget id="calculator">4+3</gadget>
<output>7</output>
7.
So Oliver has $14 - $7 = $
<gadget id="calculator">14-7</gadget>
<output>7</output>
7 left.
His friend gives him $8, so now he has $7 + $8 = $
<gadget id="calculator">7+8</gadget>
<output>15</output>
15.

<result>15</result>