The number of roosters in Xiaoming’s family is 3/5 of that of hens, and the number of hens is 100 more than that of roosters. How many hens are there?
小明家公鸡只数是母鸡的(3/5)，母鸡的只数比公鸡多100只，母鸡有多少只？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">100 / (2/5)</gadget>
<output>250</output>

<result>250</result>