It costs 4.5 yuan more to buy 3 pens than to buy 5 ballpoint pens. The price of each ballpoint pen is 1.5 yuan. How much is each pen?
买3支钢笔比买5支圆珠笔要多花4.5元．每支圆珠笔的价钱是1.5元．每支钢笔多少钱？
<gadget id="calculator">5 * 1.5</gadget>
<output>7.5</output>

<gadget id="calculator">7.5 + 4.5</gadget>
<output>12</output>

<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<result>4</result>