SOLUTION: Hi! Please help me with this age related problem: A professor is three times as old as one of his pupil, Freddie. Four years ago he was four times as old as Freddie was at that tim

Question 953089: Hi! Please help me with this age related problem: A professor is three times as old as one of his pupil, Freddie. Four years ago he was four times as old as Freddie was at that time. How old is Freddie? Thank you so much!
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A professor is three times as old as one of his pupil, Freddie. Four years ago he was four times as old as Freddie was at that time. How old is Freddie?
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Equations:
p = 3f
p-4 = 4(f-4)
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Substitute for "p" and solve for "f"::
3f-4 = 4f-16
f = 12 (Freddie age now)
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p = 3f = 36 (Professor's age now)
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Cheers,
Stan H.
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