The scoring rules for football games are: 3 points for a win, 1 point for a tie, and 0 points for a loss. A middle school football team participated in 15 games, lost 4 games, and scored 29 points in total. How many games did the team win?
足球比赛的记分规则是：胜一场记3分，平一场记1分，负一场记0分．一支中学生足球队参加了15场比赛，负了4场，共得29分，则这支球队胜了多少场
<gadget id="calculator">15 - 4</gadget>
<output>11</output>

<gadget id="calculator">29 - 11</gadget>
<output>18</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<result>9</result>