Question
At a christmas party, every parent brought 1 or 3 children. If the ratio of the number of parents to the number of children was 5 : 7, what fraction of the parents who brought 1 child?
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At a christmas party, every parent brought 1 or 3 children. If the ratio of the number of parents to the number of children was 5 : 7, what fraction of the parents who brought 1 child?