The price of 2 notebooks is equal to the price of 8 homework books, and the price of 5 notebooks is equivalent to the price of how many homework books.
2本笔记本的价钱与8本作业本的价钱相等，5本笔记本的价钱相当于多少本作业本的价钱．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<result>20</result>