Xiaohong bought 5 notebooks for 9 yuan, and Xiaojun bought 6 of the same notebooks, how much does it cost? (Solved using ratio method)
小虹买5本笔记本用了9元，小军买同样的笔记本6本，需要多少元？(用比例的方法解)
<gadget id="calculator">9 / 5</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">(9/5) * 6</gadget>
<output>54/5 = around 10.8</output>

<result>54/5 = around 10.8</result>