In a flock of chickens, there are 12 hens, accounting for 2/5 of the total. How many chickens are there in total?
一群鸡中，母鸡有12只，占总数的(2/5)．这群鸡一共有多少只．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">12 / (2/5)</gadget>
<output>30</output>

<result>30</result>