Xiao Ming bought 1 pen and 7 exercise books, and Jun Jun bought 12 of the same exercise books, and the two spent the same amount of money. The price of a pen is equal to the price of how many exercise books.
小明买了1枝钢笔和7本练习本，君君买了12本同样的练习本，两人用去的钱一样多．一枝钢笔的价钱等于多少本练习本的价钱．
<gadget id="calculator">12 - 7</gadget>
<output>5</output>

<result>5</result>