The school has 1,800 science books, and the number of story books is 350 less than twice the number of science books. How many story books and science books are there altogether?
学校有科技书1800本，故事书的本数比科技书的2倍少350本，故事书和科技书一共有多少本？
<gadget id="calculator">1_800 * 2</gadget>
<output>3_600</output>

<gadget id="calculator">3_600 - 350</gadget>
<output>3_250</output>

<gadget id="calculator">3_250 + 1_800</gadget>
<output>5_050</output>

<result>5_050</result>