Xiaodong takes 36 shots for the first time, 45 shots for the second time, and 39 shots for the third time. How many shots are taken on average each time?
小东拍皮球，第一次拍36下，第二次拍45下，第三次拍39下，平均每次拍多少下？
<gadget id="calculator">36 + 45 + 39</gadget>
<output>120</output>

<gadget id="calculator">120 / 3</gadget>
<output>40</output>

<result>40</result>