The school holds a dance competition. There are 13 people in class one, 15 people in class two, 12 people in class three, and 16 people in class four. How many people participate in the game on average per class?
学校举行舞蹈比赛．一班有13人参加，二班有15人参加，三班有12人参加，四班有16人参加．平均每班有多少人参加比赛？
<gadget id="calculator">13 + 15 + 12 + 16</gadget>
<output>56</output>

<gadget id="calculator">56 / 4</gadget>
<output>14</output>

<result>14</result>