Li Jun and Zhang Qiang paid the same amount of money for the same pencil, Li Jun asked for 13, Zhang Qiang asked for 7, and Li Jun gave Zhang Qiang another 0.6 yuan. How much is each pencil.
李军和张强付同样多的钱买了同一种铅笔，李军要了13支，张强要了7支，李军又给张强0.6元钱．每支铅笔多少元．
<gadget id="calculator">13 + 7</gadget>
<output>20</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">13 - 10</gadget>
<output>3</output>

<gadget id="calculator">0.6 / 3</gadget>
<output>0.2</output>

<result>0.2</result>