During the Arbor Day event, the fourth grade planted 84 trees, three times that of the third grade. The number of trees planted in the fifth grade was 18 more than the sum of the three and fourth grades. How many trees were planted in the fifth grade?
植树节活动中，四年级植树84棵，是三年级植树的3倍，五年级植树的棵树比三、四年级两个年级植树的总和还多18棵，五年级植树多少棵？
<gadget id="calculator">84 / 3</gadget>
<output>28</output>

<gadget id="calculator">28 + 84 + 18</gadget>
<output>130</output>

<result>130</result>