if n number of red pencils vost 10cents each and m number of blue pencils cost 9 cenys each what is the average cist in cents per pencil
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Total cost = 10n + 9m
Total Pencils = m + n
Cost per pencil = (10n + 9m) / (m+n)
Total Pencils = m + n
Cost per pencil = (10n + 9m) / (m+n)
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