A total of 100 teachers and students from Hope Primary School participated in the tree planting. Each teacher planted 3 trees, and every 3 students planted 1 tree on average. A total of 100 trees were planted. How many students participated in tree planting?
希望小学的师生共100人参加植树，教师每人植树3棵，学生平均每3人植树1棵，一共栽了100棵树．有几个学生参加植树？
<gadget id="calculator">100 * 3</gadget>
<output>300</output>

<gadget id="calculator">300 - 100</gadget>
<output>200</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3 - (1/3)</gadget>
<output>8/3 = around 2.666667</output>

<gadget id="calculator">200 / (8/3)</gadget>
<output>75</output>

<result>75</result>