80 trees are planted in the fourth grade, and the number of trees planted in the sixth grade is three times that of the fourth grade. How many trees are planted in total in the two grades?
四年级植树80棵，六年级植树的棵数是四年级的3倍，两个年级一共植树多少棵？
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">80 * 4</gadget>
<output>320</output>

<result>320</result>