The school needs to plant 520 trees, 65 of which have already been planted. After the remaining 5 days, how many trees are planted on average per day?
学校要种520棵树，已经种了65棵，余下的5天种完，平均每天种多少棵？
<gadget id="calculator">520 - 65</gadget>
<output>455</output>

<gadget id="calculator">455 / 5</gadget>
<output>91</output>

<result>91</result>