The number of people participating in the interest group in the fourth grade is 76, which is 18 more than twice the number of the third grade. How many people in the two grades participate in the interest group?
四年级参加兴趣小组的人数是76人，比三年级的人数的2倍多18人，两个年级一共有多少人参加兴趣小组？
<gadget id="calculator">76 - 18</gadget>
<output>58</output>

<gadget id="calculator">58 / 2</gadget>
<output>29</output>

<gadget id="calculator">29 + 76</gadget>
<output>105</output>

<result>105</result>