SOLUTION: Roberts father is 4 times as old as Roberts.After 5 years,father will be three times as old as Roberts.Find their present ages.

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Question 972490: Roberts father is 4 times as old as Roberts.After 5 years,father will be three times as old as Roberts.Find their present ages.
Answer by amarjeeth123(569) About Me  (Show Source):
You can put this solution on YOUR website!
Let Roberts age be x.
Then Roberts father's age is 4x.
After 5 years their ages are (x+5) and (4x+5) respectively.
We have (4x+5)=3(x+5)
4x+5=3x+15
x=10.
Roberts is 10 years old and his father is 40 years old.