There are 480 trees to be planted on the campus of Hedian Primary School, with an average of 60 trees planted in the first 5 days, and the rest of the tasks should be completed within 4 days. How many trees are planted per day on average?
禾甸小学校园内要植树480棵，前5天平均植树60棵，余下的任务要在4天内植完，平均每天植树多少棵？
<gadget id="calculator">60 * 5</gadget>
<output>300</output>

<gadget id="calculator">480 - 300</gadget>
<output>180</output>

<gadget id="calculator">180 / 4</gadget>
<output>45</output>

<result>45</result>