There are 150 willow trees by the lake, the number of willow trees is three times that of poplar trees, and the number of pine trees is 75 more than that of poplar trees. How many pine trees are there?
湖边有柳树150棵，柳树的棵树是杨树的3倍，松树的棵树比杨树多75棵．松树有多少棵？
<gadget id="calculator">150 / 3</gadget>
<output>50</output>

<gadget id="calculator">50 + 75</gadget>
<output>125</output>

<result>125</result>