There are 96 students in the sixth grade of Hope Primary School participating in the tree planting activity, which is 3 times less than the number of participants in the third grade. How many people in the third grade participated in the tree planting?
希望小学六年级学生参加植树活动的有96人，比三年级参赛人数的3倍少3人．三年级参加植树的有多少人？
<gadget id="calculator">3 + 96</gadget>
<output>99</output>

<gadget id="calculator">99 / 3</gadget>
<output>33</output>

<result>33</result>