Xiao Ming bought 2 mechanical pencils and spent 4 yuan; Xiao Jiang bought 2 pens and spent 10 yuan. How much less does a mechanical pencil cost than a fountain pen? (answer in two ways)
小明买了2支自动铅笔，用了4元钱；小江买了2支钢笔，用了10元钱．一支自动铅笔比一支钢笔少用多少钱？(用两种方法解答)
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

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

<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<result>3</result>