Posted by Mariah on Thursday, September 16, 2010 at 9:26am.
Juan is 8 years older than his sister Rosa.One day, Juan tells Rosa he is twice her age, but will only be twice her age for one year.To figure out the ages of Juan and Rosa you must first identify the variables. What are the variables in this problem?

Algebra  MathMate, Thursday, September 16, 2010 at 9:40am
The variables are the unknowns in the story.
Do you know the age of Juan, of Rosa?

Algebra  Henry, Friday, September 17, 2010 at 2:56pm
X = Rosa age
X + 8 = 2x = Juan age
x + 8 = 2x
x = 8 = Rosa age
2 * x = 2 * 8 = 16 = Juan age.
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