The forest farm planted 450 pine saplings and 270 cypress saplings. Plant these saplings into 40 rows, how many trees are planted in each row on average?
林场栽了450棵松树树苗，栽了270棵柏树树苗．将这些树苗栽成40行，平均每行栽多少棵？
<gadget id="calculator">450 + 270</gadget>
<output>720</output>

<gadget id="calculator">720 / 4</gadget>
<output>180</output>

<result>180</result>