The bookstore shipped 12,000 story books, 4,800 more than technology books. How many story books and technology books were shipped in?
书店里运来故事书12000本，比科技书多4800本，运进的故事书和科技书共有多少本？
<gadget id="calculator">12_000 - 4_800</gadget>
<output>7_200</output>

<gadget id="calculator">7_200 + 12_000</gadget>
<output>19_200</output>

<result>19_200</result>