Xiaoqiang went to the stationery supermarket and bought a fountain pen and a ballpoint pen for 15.4 yuan. It is known that the price of a fountain pen is 4.5 times that of a ballpoint pen. How much is a pen?
小强到文具超市买了一只钢笔和一支圆珠笔共用15.4元，已知一支钢笔的价钱是一支圆珠笔的4.5倍，请问一支钢笔多少元？
<gadget id="calculator">4.5 + 1</gadget>
<output>5.5</output>

<gadget id="calculator">15.4 / 5.5</gadget>
<output>2.8</output>

<gadget id="calculator">2.8 * 4.5</gadget>
<output>12.6</output>

<result>12.6</result>