There are 160 peach and apricot trees in the orchard, and the number of peach trees is three times that of apricot trees. How many apricot trees are planted? (solution by equation)
果园里桃树和杏树一共160棵，其中桃树的棵数是杏树的3倍．杏树种了多少棵？(用方程解)
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">160 / 4</gadget>
<output>40</output>

<result>40</result>