Xiaohong and Xiaolin went to buy the same story book, Xiaohong bought 7 books, Xiaolin bought 5 books, Xiaohong spent 36 yuan more than Xiaolin. How much is this storybook?
小红和小林去买同样的故事书，小红买了7本，小林买了5本，小红用的钱比小林多36元．这种故事书每本多少钱？
<gadget id="calculator">7 - 5</gadget>
<output>2</output>

<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<result>18</result>