There are 230 scientific and technological books in the school library, 40 literary and art books are twice as many as scientific and technological books, and 15 less than three times as many story books as literary and art books. How many story books are there?
学校图书馆有科技书230本，文艺书比科技书的2倍还多40本，故事书又比文艺书的3倍少15本，故事书有多少本？
<gadget id="calculator">230 * 2</gadget>
<output>460</output>

<gadget id="calculator">460 + 40</gadget>
<output>500</output>

<gadget id="calculator">500 * 3</gadget>
<output>1_500</output>

<gadget id="calculator">1_500 - 15</gadget>
<output>1_485</output>

<result>1_485</result>