Li Juan bought 5 ballpoint pens and 3 exercise books, and paid 7.2 yuan in total. Each exercise book is 0.4 yuan. How much is each ballpoint pen? (solution by equation)
李娟同学买了5支圆珠笔与3本练习本，共付7.2元，每本练习本0.4元，每支圆珠笔多少钱？(用方程解)
<gadget id="calculator">3 * 0.4</gadget>
<output>1.2</output>

<gadget id="calculator">7.2 - 1.2</gadget>
<output>6</output>

<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>