The school bought a batch of books, including 430 story books, and twice as many science books as story books. How many story books and science books are there altogether?
学校买来一批图书，其中故事书有430本，科技书的数量是故事书的2倍，故事书和科技书一共有多少本？
<gadget id="calculator">430 * 2</gadget>
<output>860</output>

<gadget id="calculator">860 + 430</gadget>
<output>1_290</output>

<result>1_290</result>