SOLUTION: Berto is 5 years older than Joana. Three years ago, the sum of their ages is 21. How old are Berto and Joana now?

Question 1190140: Berto is 5 years older than Joana. Three years ago, the sum of their ages is 21. How old are Berto and Joana now?
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

let Berto’s age be and Joana’s age
if Berto is years older than Joana, we have
......eq.1
if three years ago, the sum of their ages is , we have

..........substitute from eq.1

go to
......eq.1, ..substitute

Berto is and Joana is now.

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