SOLUTION: Alex is 4 years older than mark. Mark's age is 4/5 Alex's age. What are their ages?

Question 599004: Alex is 4 years older than mark. Mark's age is 4/5 Alex's age. What are their ages?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Alex is 4 years older than mark. Mark's age is 4/5 Alex's age. What are their ages?
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Equations:
a = m + 4
m = (4/5)a
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Substitute for "m" and solve for "a":
a = (4/5)a + 4
(1/5)a = 4
a = 20 yrs (Alex's age)
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Solve for "m":
m = (4/5)a = (4/5)20 = 16 yrs (Mark's age)
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Cheers,
Stan H.
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