Zhang Ming is learning to measure. He measured that five Xinhua Dictionaries stacked together are 15 centimeters high. He stacked the same "Xinhua Dictionaries" together, and the measured height is 72 centimeters. So how many dictionaries did he stack up? together?
张明正在学习测量，他测得5本《新华字典》摞在一起高15厘米，他把同样的一些《新华字典》摞在一起，量得高度是72厘米，那么他是把几本字典摞在一起的？
<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<gadget id="calculator">72 / 3</gadget>
<output>24</output>

<result>24</result>