The students participated in the tree planting activity. The number of peach trees planted was 20 less than that of pear trees, and 160 peach trees were planted. How many pear trees were planted?
同学们参加植树活动，植的桃树比梨树的3倍少20棵，桃树植了160棵，梨树植了多少棵？
<gadget id="calculator">160 + 20</gadget>
<output>180</output>

<gadget id="calculator">180 / 3</gadget>
<output>60</output>

<result>60</result>