The third and fourth grade students of a certain elementary school collected waste paper, 45 students in the third grade collected a total of 3375 grams, and 47 students in the fourth grade collected a total of 4905 grams. How many grams did each of the two grades collect on average?
某小学三、四年级学生收集废纸，三年级45人，一共收集3375克，四年级47人，一共收集4905克．两个年级平均每人收集多少克？
<gadget id="calculator">3_375 + 4_905</gadget>
<output>8_280</output>

<gadget id="calculator">45 + 47</gadget>
<output>92</output>

<gadget id="calculator">8_280 / 92</gadget>
<output>90</output>

<result>90</result>