Xiaoping's collection of 48 books is three times that of Xiaogang's collection. How many books does Xiaogang have? (First list the equations containing unknowns, and then solve them)
小平藏书48本，是小刚藏书本数的3倍，小刚有多少本书？(先列出含有未知数的等式，再解答)
<gadget id="calculator">48 / 3</gadget>
<output>16</output>

<result>16</result>