Method of Substitution to Find the Solution of a Pair of Linear Equations
Sum of age of...
Question
Sum of age of father and son is 55 years . If father was who lived in his son is equal to his present age , the total of their age woulbd be 93 years .find their present age.
Open in App
Solution
Sol: Let the present age of the son and the father be x and y respectively.
Case (i) Sum of the ages of father and son is 55 years ⇒ x + y = 55 --------- (1) Difference between their ages = (y - x) years.
Case (ii) Age of the son = x + (y - x) = y Age of the father = y + (y - x) = 2y - x (2y - x) + y = 93 3y - x = 93 ---------- (2)
Solving equations (1) and (2), we get y = 37 and x = 18.
Therefore, present age of the son is 18 years and the present age of the father is 37 years.