Three ballpoint pens are 5.4 yuan, and the price of a pen is four times that of a ballpoint pen. How much is a pen?
3支圆珠笔5.4元，一支钢笔的价钱是一支圆珠笔的4倍，一支钢笔多少元？
<gadget id="calculator">5.4 / 3</gadget>
<output>1.8</output>

<gadget id="calculator">1.8 * 4</gadget>
<output>7.2</output>

<result>7.2</result>