The third grade students planted trees. They planted 113 trees in the first 2 days and 55 trees in the third day. How many trees are planted per day on average?
三年级同学去植树，前2天共植树113棵，第3天植树55棵，平均每天植树多少棵？
<gadget id="calculator">113 + 55</gadget>
<output>168</output>

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

<gadget id="calculator">168 / 3</gadget>
<output>56</output>

<result>56</result>