The school holds a sports meeting. There are 25 participants in the second grade, three times the number of participants in the third grade, and 16 fewer participants in the fourth grade than the sum of the participants in the second and third grades. How many people in the fourth grade participated in the competition?
学校举行运动会．二年级有25人参加比赛，三年级参加的人数是二年级的3倍，四年级参加的人数比二、三年级参加的人数的和少16人．四年级参加比赛的有多少人？
<gadget id="calculator">25 * 3</gadget>
<output>75</output>

<gadget id="calculator">25 - 16</gadget>
<output>9</output>

<gadget id="calculator">75 + 9</gadget>
<output>84</output>

<result>84</result>