There are 5 butterflies and 4 times as many dragonflies as butterflies, how many dragonflies are there?
蝴蝶有5只，蜻蜓的只数是蝴蝶4倍，蜻蜓有多少只只．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>