Nathan went to the arcade. He played the air hockey game 2 times and the basketball game 4 times. If each game cost 3 tokens, how many tokens did he use?
Nathan played a total of 2 air hockey + 4 basketball = 
<gadget id="calculator">2+4</gadget>
<output>6</output>
6 games.
This cost him 6 games x 3 tokens each = 
<gadget id="calculator">6*3</gadget>
<output>18</output>
18 tokens.

<result>18</result>