The school brigade plans to plant 850 trees. It has been planted for 8 days, with an average of 70 trees per day. The rest will be completed in 5 days. How many trees should be planted per day on average. (Column comprehensive formula solution)
学校大队部计划植树850棵，已经植8天，平均每天植株70棵，余下的要在5天完成，平均每天应植树多少棵．(列综合算式解答)
<gadget id="calculator">70 * 8</gadget>
<output>560</output>

<gadget id="calculator">850 - 560</gadget>
<output>290</output>

<gadget id="calculator">290 / 5</gadget>
<output>58</output>

<result>58</result>