SOLUTION: A father is thrice as old as his son. Five years ago, he was four times as old as his son. How old is the father now?

Question 1133057: A father is thrice as old as his son. Five years ago, he was four times as old as his son. How old is the father now?

Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
let x be the age of the father's son, then father's age is 3x
:
3x -5 = 4(x-5)
:
3x -5 = 4x -20
:
x = 15
:
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father's age is 3 * 15 = 45 years old
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check the answer
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5 years ago, the son is 15 - 5 = 10 years old
:
5 years ago, the father is 45 - 5 = 40 years old
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therefore the father's age is 4 times the son's age
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answer checks
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