10 yuan can buy 2 notebooks. At this price, how many notebooks of this kind can 30 yuan buy?
10元能买2本笔记本，照这样的价格，30元能买多少本这种笔记本．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<result>6</result>