# SOLUTION: kindly help me with this other problem. PLEASE A father is 20 years older than his son. In 4 years time he will be twice as old as his son. Determine their present ages.

Algebra ->  Algebra  -> Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: kindly help me with this other problem. PLEASE A father is 20 years older than his son. In 4 years time he will be twice as old as his son. Determine their present ages.      Log On

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 Question 139180: kindly help me with this other problem. PLEASE A father is 20 years older than his son. In 4 years time he will be twice as old as his son. Determine their present ages.Answer by ankor@dixie-net.com(15622)   (Show Source): You can put this solution on YOUR website!write an equation for each statement: :A father is 20 years older than his son." f = s + 20 : " In 4 years time he will be twice as old as his son." f + 4 = 2(s+4) f = 4 = 2s + 8 f = 2s + 8 - 4 f = 2s +4 : Determine their present ages. : Substitute (s+20) for f in the above equation, (from the 1st equation); find s: s + 20 = 2s + 4 20 - 4 = 2s - s 16 = s : The son is 16 and the father is (16+20) = 36 : : Check solution in the statement: "In 4 years time he will be twice as old as his son. " 36 + 4 = 2(16 + 4); confirms our solution