问题
解答题
花园小学组织四、五年级的学生参加社会实践活动．四年级109人，平均每人掰玉米31个；五年级110人，平均每人掰玉米38个．估算一下，四、五年级的学生大约各掰玉米多少个？
答案
（109×31+110×38）÷（109+110），
≈（3300+4400）÷220，
=7700÷220，
=35（个）；
答：四、五年级的学生大约各掰玉米35个．
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花园小学组织四、五年级的学生参加社会实践活动．四年级109人，平均每人掰玉米31个；五年级110人，平均每人掰玉米38个．估算一下，四、五年级的学生大约各掰玉米多少个？
（109×31+110×38）÷（109+110），
≈（3300+4400）÷220，
=7700÷220，
=35（个）；
答：四、五年级的学生大约各掰玉米35个．
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