It costs 5.6 yuan to buy a pen and a ruler, and 3.2 yuan for each ruler. How much is a pencil?
买一支笔和一把尺子一共用去5.6元，尺子每把3.2元，一支铅笔多少钱？
<gadget id="calculator">5.6 - 3.2</gadget>
<output>2.4</output>

<result>2.4</result>