There are 100 goats. There are fewer goats than sheep (1/5). How many sheep are there?
山羊100只，山羊比绵羊少(1/5)，绵羊有多少只？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">100 / (4/5)</gadget>
<output>125</output>

<result>125</result>