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 203513: 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 rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
Let x=sister=8 yrs
let 2x-4=Ricardo =12 yrs
x+2x-4=20
3x=24
x=8