The school spent a total of 1,800 yuan on books, including 2.5 yuan for each storybook and 650 yuan for picture books. How many storybooks did the school buy?
学校买图书一共用去1800元，其中每本故事书2.5元，图画书用去650元，学校买了多少本故事书？
<gadget id="calculator">1_800 - 650</gadget>
<output>1_150</output>

<gadget id="calculator">1_150 / 2.5</gadget>
<output>460</output>

<result>460</result>