SOLUTION: frank is eight years older than his sister. In three year he will be twice as old as she is. how old are they now

Question 450534: frank is eight years older than his sister. In three year he will be twice as old as she is. how old are they now
Answer by poliphob3.14(115) (Show Source): You can put this solution on YOUR website!
Let the sister's age now x years, then Frank's age is now x+8 years. After 3 years their ages will be: Frank's age x+11 and his sister's age x+3.
Since after 3 years Frank's age is twice as old as she is, write the equation.
=>. Frank is now 5+8=13 years old.
Answer:Frank is now 13 years old and his sister is 5 years old.
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