The volleyball team has 15 players, and the basketball team has four times as many players as the volleyball team. The basketball team trains from Monday to Friday. On average, how many people participate in the training every day?
排球队有15人，篮球队的人数是排球队的4倍．篮球队从周一至周五进行训练，平均每天有多少人参加训练？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">15 * (4/5)</gadget>
<output>12</output>

<result>12</result>