Students from two classes in the fourth grade planted trees. The first class planted 48 trees, while the number of trees planted by the second class was three times less than that of the first class by 20. How many more trees will the second class plant than the first class?
四年级两个班的同学去植树，一班植树48棵，二班植树的棵数比一班的3倍少20棵．二班比一班多植树多少棵？
<gadget id="calculator">3 * 48</gadget>
<output>144</output>

<gadget id="calculator">144 - 20 - 48</gadget>
<output>76</output>

<result>76</result>