There are 18 people jumping high on the playground, and the number of people running is three times that of high jumping people. How many people are running?
操场上有18人在跳高，跑步的人数是跳高的3倍，跑步的有多少人．
<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<result>54</result>