The school has 800 science and technology books, twice as many as story books. How many books are there in total? What is the correct column
学校有科技书800本，是故事书的2倍，两种书一共有多少本？正确列式是多少
<gadget id="calculator">800 / 2</gadget>
<output>400</output>

<gadget id="calculator">800 + 400</gadget>
<output>1_200</output>

<result>1_200</result>