Question 267633
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. 
I only got as far as their age now is:
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Let Father be 2x yrs old
Robert is then x yrs old
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Equation:
(x-12) = (1/3)(2x-12)
3x-36 = 2x-12
x = 24 (Robert's age now)
2x = 48 (Father's age now)
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Cheers,
Stan H.



 
Robert = (1/2) x
Father = x 
Twelve years ago: 
Father = x-12
Robert = 1/3 (x -12) ???