There are 15 people skipping rope in a physical education class. The number of people who play basketball is 2/3 of the number of people who skip rope.
体育课上有15人跳绳，打球的人数是跳绳人数的(2/3)，练长跑的人数是打球人数的(4/5)，练长跑的有多少人？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">15 * (2/3) * (4/5)</gadget>
<output>8</output>

<result>8</result>