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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
let x= the one you don' t have any information therefore
x= 3 yr olds
1/2 x= 2 yr olds
x= 4 yr. old
x+1/2x+x=45
2x+1/2x=45
make the fraction a whole number by multiplying the equation by 2
4x+x=90
5x=90
x=18 # of 3yr olds
1/2(18)=9 # of 2 yr olds
x=18. # of 4 yr olds
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