The average lifespan of an elephant is 20 years, about four times that of a tiger. How many years is the average lifespan of a tiger?
大象的平均寿命是20年，约是老虎平均寿命的4倍，老虎的平均寿命大约是多少年？
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<result>5</result>