Xiaohong has 150 books, three times that of Xiaogang. How many books does Xiaohong have more than Xiaogang?
小红有150本图书，是小刚的3倍，小红比小刚多多少本．
<gadget id="calculator">150 / 3</gadget>
<output>50</output>

<gadget id="calculator">150 - 50</gadget>
<output>100</output>

<result>100</result>