There are 5 butterflies in a small garden, and the number of bees is 4 times that of butterflies. How many bees are there?
小花园里有5只蝴蝶，蜜蜂的只数是蝴蝶的4倍，蜜蜂有多少只．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>