Xiaohong bought 6 colored pens and 3 notebooks, and they shared 13.5 yuan. Knowing that each colored pen is 1.8 yuan, how much is each notebook?
小红买了6支彩笔和3个笔记本，共用去13.5元，已知每支彩笔啊1.8元，每个笔记本多少钱？
<gadget id="calculator">1.8 * 6</gadget>
<output>10.8</output>

<gadget id="calculator">13.5 - 10.8</gadget>
<output>2.7</output>

<gadget id="calculator">2.7 / 3</gadget>
<output>0.9</output>

<result>0.9</result>