Wang Fang and Liu Qiang spent the same amount of money to jointly buy a batch of audio tapes. Wang Fang took away 12 boxes, and Liu Qiang took 8 boxes. After returning home, Wang Fang gave Liu Qiang 13 yuan. How much is each tape?
王芳和刘强拿出同样多的钱合买一批录音磁带，王芳拿走了12盒，刘强拿走了8盒，回家后，王芳补给刘强13元．请问每盒录音带多少元？
<gadget id="calculator">13 * 2</gadget>
<output>26</output>

<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">26 / 4</gadget>
<output>13/2 = around 6.5</output>

<result>13/2 = around 6.5</result>