Xiaolan originally had 18.4 yuan, and her mother gave him another 7.2 yuan. Xiaolan bought 4 pens with the money. How much is each pen?
小兰原来有18.4元，妈妈又给了他7.2元，小兰用这些钱买了4枝钢笔，每枝钢笔多少元？
<gadget id="calculator">18.4 + 7.2</gadget>
<output>25.6</output>

<gadget id="calculator">25.6 / 4</gadget>
<output>6.4</output>

<result>6.4</result>