5 people make one phone call every 2 people, how many phone calls in total?
5个人每2个人通一次电话，一共通多少次电话．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">4 * (5/2)</gadget>
<output>10</output>

<result>10</result>