45 children attend 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 number of three-year-olds. how many two-year-olds attend the preschool? how many three-year-olds attend the preschool? how many four-year-olds attend the preschool?

9 - 2 yr olds, 18 - 3 yr olds, and 18 - 4 yr olds

Step-by-step explanation:

2 yr olds:

3 yr olds:  x

4 yr olds:  x

2 yr olds + 3 yr olds + 4 yr olds = Total students

     +       x        +       x       =        45

( ͡° ͜ʖ ͡°)

step-by-step explanation:

just copy and paste it.

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450 is the final answer! : )