Zhang Yun bought 4 identical notebooks in the supermarket and spent 6 yuan. Wang Meng also wants to buy 5 of the same notebook, how much will it cost? (Solve with ratio)
张云在超市买了4本相同的笔记本用了6元钱．王萌也想买5本同样的笔记本，要用多少钱？(用比例解)
<gadget id="calculator">6 / 4</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) * 5</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>