The Children's Day is coming. The students in the third grade made 200 small animal headdresses and gave 120 to the kindergarten. The rest will be distributed to the students in the first and second grades on average. What is the average distribution for each grade? a tiara?
"六一"儿童节到了，三年级的同学们做了200个小动物头饰，送给幼儿园120个，剩下的平均分给一、二两个年级的同学们，平均每个年级分到多少个头饰？
<gadget id="calculator">200 - 120</gadget>
<output>80</output>

<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<result>40</result>