Teacher Wang used 200 yuan to buy books for the class. He bought 13 books of different fairy tales and got back 5 yuan. How much is each fairy tale book on average?
王老师拿200元钱为班级买图书，买了13本，不同的童话故事书，找回5元钱，平均每本童话故事书多少钱？
<gadget id="calculator">200 - 5</gadget>
<output>195</output>

<gadget id="calculator">195 / 13</gadget>
<output>15</output>

<result>15</result>