The school has 324 science and technology books, twice as many as story books. How many science and story books are there altogether?
学校有科技书324本，是故事书的2倍，科技书和故事书一共有多少本？
<gadget id="calculator">324 / 2</gadget>
<output>162</output>

<gadget id="calculator">162 + 324</gadget>
<output>486</output>

<result>486</result>