SOLUTION: A father is nine times the age of his son. In 5 years he will be four times the age of his son. How old are they now?

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Question 426356: A father is nine times the age of his son. In 5 years he will be four times the age of his son. How old are they now?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Son's age x
Father's age 9x
5 years later
Son's age x +5
Father's age 9x+5
Father's age 4 times older
9x+5=4( x+5)
9x+5=4x+20
5x=20-5
5x=15
/5
x=3 Son's age
x+20=23 years Father's age