240 trees were shipped in the first tree planting activity, and 160 trees were shipped in the second time. Every 4 trees are planted in a row, how many rows can these trees be planted in total?
植树活动第一次运来240棵树，第二次运来160棵树．每4棵树种成一行，这些树一共可以种成多少行？
<gadget id="calculator">240 + 160</gadget>
<output>400</output>

<gadget id="calculator">400 / 4</gadget>
<output>100</output>

<result>100</result>