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The sum of a father’s and son’s ages is 50 years and their difference is 30 years. What is the father’s age?

Answer and explanation

Correct answer: 40 years

The governing concept is solving a pair of simultaneous linear equations by elimination. Let the father’s age be x years and the son’s age be y years. The information gives x+y=50 and x−y=30, because the father is older. Adding the two equations eliminates y: (x+y)+(x−y)=50+30, so 2x=80 and x=40. Therefore the father is 40 years old, so option A is correct. Substitution confirms the result: the son’s age is 50−40=10, and 40−10=30, exactly as required. Options B, C, and D do not satisfy both the stated sum and the stated difference simultaneously.

Related tags

Pair Of Linear EquationsElimination MethodAge Word ProblemClass 10Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematics

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