A pen is 19 yuan cheaper than a schoolbag, and the price of a schoolbag is 1.5 times that of a pen. How much is a pen?
一支钢笔比一个书包便宜19元，一个书包的价钱是一支钢笔的1.5倍，一支钢笔多少元？
<gadget id="calculator">1.5 - 1</gadget>
<output>0.5</output>

<gadget id="calculator">19 / 0.5</gadget>
<output>38</output>

<result>38</result>