Xiaohong bought 5 pencils and 3 pens, and the total cost is 12 yuan. Each pen is 3.5 yuan. How much is each pencil? (Solution of column equation)
小红买了5支铅笔和3支钢笔，共用去12元，每支钢笔3.5元，每支铅笔多少元？(列方程解)
<gadget id="calculator">3 * 3.5</gadget>
<output>10.5</output>

<gadget id="calculator">12 - 10.5</gadget>
<output>1.5</output>

<gadget id="calculator">1.5 / 5</gadget>
<output>0.3</output>

<result>0.3</result>