For this case we have that, the cost of 5 dolls is $130. If we want to know the number of dolls that can be bought with $390 we make a rule of three:
5 dolls -----------> $130
x --------------------> $390
Where the variable "x" represents the number of dolls that can be purchased with $390.
[tex]x = \frac {390 * 5} {130}\\x = 3 * 5\\x = 15[/tex]
Thus, you can buy 15 dolls.
Answer:
15 dolls
