Small strong softball, the results of three times are 29 meters, 30 meters, 28 meters respectively, what is the average score of small strong softball in meters
小强掷垒球，三次的成绩分别是29米、30米、28米，小强掷垒球的平均成绩是多少米
<gadget id="calculator">29 + 30 + 28</gadget>
<output>87</output>

<gadget id="calculator">87 / 3</gadget>
<output>29</output>

<result>29</result>