You can buy 6 fish for the price of 2 chickens, 9 identical books for the price of 3 fish, and how many chickens can you buy for the price of 36 books.
买2只鸡的钱可以买6条鱼，买3条鱼的钱可买9本一样的书，买36本书的钱可以买多少只鸡．
<gadget id="calculator">36 / 9</gadget>
<output>4</output>

<result>4</result>