Ratios of Children

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At a certain school, the ratio of the number of five-year-old's to the number of nine-year-old's is 12 to 5, and the ratio of the number of four-year-old's to the number of five-year old's is 3 to 4. If the ratio of the number of eight-year-old's to the number of nine-year-old's is 3 to 2, what is the ratio of the number of four-year-old's to the number of eight-year-old's?