SOLUTION: the sum of age of a man and his son is 100 yrs. 30 yrs ago the man was three times as old as his son. find the age of his son at present?

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Question 311489: the sum of age of a man and his son is 100 yrs. 30 yrs ago the man was three times as old as his son. find the age of his son at present?
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


Let represent the age of the father. Let represent the age of the son. Then



and



Solve the first equation for y:



Substitute:



Just solve for . The other value follows directly.

John