Sika deer generally live for 20 years, and the average lifespan of an elephant is about four times that of a sika deer. How many years can an elephant usually live?
梅花鹿一般活20年，大象的平均寿命大约是梅花鹿的4倍，大象一般能活多少年？
<gadget id="calculator">20 * 4</gadget>
<output>80</output>

<result>80</result>