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Forty-five children attend a preschool. The number of two-year-olds is one
half the number of three-year-olds. The number of four-year-olds is the
same as the number of 3-year-olds.
a. How many two-year-olds attend the preschool?
b. How many three-year-olds attend the preschool?
c. How many four-year-olds attend the preschool?