The students of Yuhong Elementary School planted trees, and the fourth grade planted 69 trees, three times the number of trees planted by the third grade students. The number of trees planted in the fifth grade is 15 more than the total number of trees planted in the third and fourth grades. How many trees are planted by the fifth graders?
育红小学同学们去植树，四年级植树69棵，是三年级同学植树棵数的3倍．五年级植树棵数比三、四年级植树的总数多15棵，五年级同学植树多少棵？
<gadget id="calculator">69 / 3</gadget>
<output>23</output>

<gadget id="calculator">69 + 23 + 15</gadget>
<output>107</output>

<result>107</result>