SOLUTION: I'm confused and unsure of how to set up the following problem: Ricky is 3 years older than his sister, Sara. 1 years ago, he was twice her age. How old is Ricky now?

Question 788960: I'm confused and unsure of how to set up the following problem:
Ricky is 3 years older than his sister, Sara. 1 years ago, he was twice her age. How old is Ricky now?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Ricky is 3 years older than his sister, Sara. 1 years ago, he was twice her age. How old is Ricky now?
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Equations:
r = s + 3
r-1 = 2(s-1)
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s = r-3
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Substitute for s and solve for r::
r-1 = 2(r-3 -1)
r-1 = 2(r-4)
r-1 = 2r-8
r = 7 (Ricky's age now)
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Cheers,
Stan H.
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