The Young Pioneers planted trees on Arbor Day. They planted 180 trees on the first day, and 315 trees on the second and third days. How many trees are required to be planted on average every day?
少先队员植树节栽树，第一天栽了180棵，第二天、第三天共栽了315棵，要求平均每天栽多少棵，列式为多少
<gadget id="calculator">180 + 315</gadget>
<output>495</output>

<gadget id="calculator">495 / 3</gadget>
<output>165</output>

<result>165</result>