In the Red Scarf Library, there are 278 books on shelf A and 327 books on shelf B. How many books are there on the two shelves?
红领巾图书馆里，甲书架上有278本书，乙书架上有327本书，甲乙两个书架上共有多少本书？
<gadget id="calculator">278 + 327</gadget>
<output>605</output>

<result>605</result>