Hello, I have a math question that has me stumped, could any give me the way to figure it out?
Tina is twice as old as her cousin Sally. Their ages when added are 21years. How many years old is each girl? Thanks

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t + s = 21
t = 2s
Solve the system

2s + s = 21
3s = 21
s = 7
t = 14

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