Mom went to the supermarket and bought 6 pens, paid 100 yuan, and got 4 yuan back. How much is each pen?
妈妈到超市买了6支钢笔，付100元，找回4元．每支钢笔多少元？
<gadget id="calculator">100 - 4</gadget>
<output>96</output>

<gadget id="calculator">96 / 6</gadget>
<output>16</output>

<result>16</result>