Gaoshan Elementary School holds a sports meeting. There are 15 people participating in long-distance running, twice as many people participating in sprinting as long-distance running, and 2/5 people participating in high jump as sprinting. How many people participate in high jump?
高山小学召开运动会，参加长跑的有15人，参加短跑的人数是长跑人数的2倍，参加跳高的人数是短跑人数的(2/5)，参加跳高的有多少人？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">15 * 2 * (2/5)</gadget>
<output>12</output>

<result>12</result>