pen is 27.4 yuan more expensive than a notebook 8.9 yuan I want to buy a pen and a notebook at least how much money should I bring?
一支钢笔27.4元比一个笔记本贵8.9元我想买一支钢笔和一个笔记本至少要带多少钱？
<gadget id="calculator">27.4 - 8.9</gadget>
<output>18.5</output>

<gadget id="calculator">18.5 + 27.4</gadget>
<output>45.9</output>

<result>45.9</result>