The ratio of chickens to ducks is 5:3. If there are 25 chickens, how many ducks are there?
鸡、鸭只数的比是5：3，鸡有25只，鸭有多少只．
<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">25 / (5/3)</gadget>
<output>15</output>

<result>15</result>