There are 5 teachers in the sixth grade, how many times can every two people talk on the phone once?
六年级有5位老师，每两个人通一次电话，可以通多少次话？
<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>