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The sum of two numbers is (21) and their difference is (5). What is the larger number?

Answer and explanation

Correct answer: 13

Let the larger number be \(x\) and the smaller number be \(y\). Then \(x+y=21\) and \(x-y=5\). Adding the equations gives \(2x=26\), so \(x=13\). Therefore, the larger number is 13. If 14 were chosen, the other number would be 7 and their difference would be 7, not 5. Exam tip: In sum-and-difference questions, add the two equations to find the larger number directly.

Related tags

Pair Of Linear EquationsElimination MethodWord ProblemsClass 10AlgebraAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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