Xiao Ming and Xiao Qiang each read the same story book. Xiaoqiang watched it for 3 days first, and then Xiaoming started to watch it. Xiao Ming reads 12 pages a day, and Xiao Qiang reads 8 pages a day, but both of them finish reading at the same time. How many pages does this storybook have?
小明和小强各看一本相同的故事书．小强先看了3天，小明才开始看．小明每天看12页，小强每天看8页，结果两人同时看完．这本故事书有多少页？
<gadget id="calculator">3 * 8</gadget>
<output>24</output>

<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">12 * 6</gadget>
<output>72</output>

<result>72</result>