There are 15 people in a queue. Now the number one and two count, and the person who counts two quits. Then, how many people are there in the team?
一个队列有15人，现在一、二报数，报二的人退出，那么，队里还有多少个人．
<gadget id="calculator">15 - 7</gadget>
<output>8</output>

<result>8</result>