It costs 4.8 yuan less to buy 5 ballpoint pens than to buy 4 fountain pens. The price of each ballpoint pen is 0.8 yuan. How much is each pen? (solution by equation)
买5枝圆珠笔比买4枝钢笔要少花4.8元，每枝圆珠笔的价钱是0.8元，每枝钢笔是多少元？(用方程解)
<gadget id="calculator">0.8 * 5</gadget>
<output>4</output>

<gadget id="calculator">4 + 4.8</gadget>
<output>8.8</output>

<gadget id="calculator">8.8 / 4</gadget>
<output>2.2</output>

<result>2.2</result>