Question 1055850
You are 3 times older than your younger sister and you are 12 years old. Write an equation and solve for your younger sister's age. Will you be 3 times her age next year?
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1 time older = 2x as old.
2 times older = 3x as old.
3 times older = 4x as old.
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Sister's age = S
You are 4*S = 12
S = 3
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Will you be 3 times her age next year?
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No. 
You're 3 & 12.
Next year you'll be 4 & 13.