Out of the group of children, 3/4 are girls, which is 3/4 * 224 = 168 girls.
4/7 of the girls wear glasses, which is 4/7 * 168 = <<4/7*168=96>>96 girls. Answer: \boxed{96}.
3 4 of a group of children are girls. 4 7 of the girls wear glasses. If there are 224 children in the group, how many girls wear glasses?
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