Respuesta :

We have the next information

Julie bought

15 baseballs

x softballs

the total is $90 each ball cost $5

we can have the next equation for the total cost

15(5)+x(5)=90

we need to isolate the x in order to know how many softballs Julie bought

75+5x=90

5x=90-75

5x=15

x=15/5

x=3

Julie bought 3 softballs

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