To buy the same pencil, Xiaogang bought 4, Xiaoling bought 2, Xiaogang spent 80 cents more than Xiaoling. How many angles is a pencil.
买同样的铅笔，小刚买了4支，小玲买了2支，小刚比小玲多花了8角钱．一支铅笔多少角．
<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<result>4</result>