Buying 3 pens is 3.9 yuan more expensive than buying 5 water-based pens. The price of each water-based pen is 1.2 yuan. How much is each pen?
买3枝钢笔比买5枝水性笔贵3.9元，每枝水性笔的价钱是1.2元，每枝钢笔多少元？
<gadget id="calculator">5 * 1.2</gadget>
<output>6</output>

<gadget id="calculator">6 + 3.9</gadget>
<output>9.9</output>

<gadget id="calculator">9.9 / 3</gadget>
<output>3.3</output>

<result>3.3</result>