SOLUTION: Robert is one half as old as his father. Twelve years ago, Robert was one third as old as his father was then. Find their present ages.

Question 492762: Robert is one half as old as his father. Twelve years ago, Robert was one third as old as his father was then. Find their present ages.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Robert is one half as old as his father. Twelve years ago, Robert was one third as old as his father was then. Find their present ages.
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Equations:
f = 2r
3(r-12) = (f-12)
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substitute for "f" and solve for "r":
3r - 36 = 2r-12
r = 24 Robert's age now
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f = 2r
father = 48 yrs old now
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Cheers,
stan H.
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