The ratio of the number of story books, science books and fairy tale books in the school library is 4:5:6, and there are 2400 more science books than story books. How many books are there in the school library?
学校图书馆所藏的故事书、科技书和童话书册数的比是4：5：6，其中科技书比故事书多2400册，学校图书馆所藏的三种图书一共有多少册？
<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">2_400 / 1</gadget>
<output>2_400</output>

<gadget id="calculator">4 + 5 + 6</gadget>
<output>15</output>

<gadget id="calculator">2_400 * 15</gadget>
<output>36_000</output>

<result>36_000</result>