Question 1181994: Stella is 4 years older than Maria. In 12 years, Stella will be twice Maria's present age. How old is Maria now? Answer by ikleyn(52794) (Show Source):
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Stella is 4 years older than Maria. In 12 years, Stella will be twice Maria's present age.
How old is Maria now?
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Let x be the Maria's present age.
Then the Stell's age is (x+4), according to the problem's description.
In 12 years, Stella's age will be ((x+4)+12) = (x+16) years.
According to the problem's description, we can write this equation
x + 16 = 2x.
It implies
16 = 2x - x
x = 16.
ANSWER. Maria is 16 years old. It is her present age.
