There are 8 butterflies in the garden, the number of butterflies is twice that of bees, how many bees are there.
花园里有8只蝴蝶，蝴蝶的只数是蜜蜂的2倍，蜜蜂多少只．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<result>4</result>