Make a potion. The ratio of medicine to water is 1:7, how much medicine accounts for the medicine
配制一种药水．药与水的比是1：7，药占药水的多少
<gadget id="calculator">1 + 7</gadget>
<output>8</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>