It costs 0.9 yuan more to buy 3 pens than to buy 5 ballpoint pens. The price of each ballpoint pen is 0.6 yuan. How much is the price of each pen? (Solution of column equation)
买3支钢笔比买5支圆珠笔要多花0.9元，每支圆珠笔的价钱是0.6元，每支钢笔价钱是多少元？(列方程解)
<gadget id="calculator">5 * 0.6</gadget>
<output>3</output>

<gadget id="calculator">3 + 0.9</gadget>
<output>3.9</output>

<gadget id="calculator">3.9 / 3</gadget>
<output>1.3</output>

<result>1.3</result>