SOLUTION: RICARDO IS 4 YEARS LESS THAN TWICE AS OLD AS HIS SISTER. THE SUM OF THEIR AGES IS 20. HOW OLD IS RICARDO?

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Question 108863: RICARDO IS 4 YEARS LESS THAN TWICE AS OLD AS HIS SISTER.
THE SUM OF THEIR AGES IS 20.
HOW OLD IS RICARDO?
Answer by elima(1433) About Me  (Show Source):
You can put this solution on YOUR website!
RICARDO IS 4 YEARS LESS THAN TWICE AS OLD AS HIS SISTER.
THE SUM OF THEIR AGES IS 20.
r=ricardo's age
x=sisters age
r=2x-4
===================
x+2x-4=20
3x=24
x=8
so his sister is 8
Ricardo = 2(8)-4=12
:)