SOLUTION: Gerry is 3 years older than Carlo. Carlo is 3 years older than Tina. How old is Tina if the sum of all their ages is 21?

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Question 752597: Gerry is 3 years older than Carlo. Carlo is 3 years older than Tina. How old is Tina if the sum of all their ages is 21?
Answer by carealotqueen(2) About Me  (Show Source):
You can put this solution on YOUR website!
Tina--> (6+x)+(3+x)+x=21
-------> 3x+9=21
-------> 3x=12
-------> x=4
Tina is 4 years old