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If 2x + 3y = 92 and 3x + 2y = 98, which is the larger number?

Answer and explanation

Correct answer: 22

The answer is D, 22. Treat x and y as the two numbers. Add the equations: (2x+3y)+(3x+2y)=92+98, giving 5x+5y=190 and therefore x+y=38. Now subtract the first equation from the second: (3x+2y)−(2x+3y)=98−92, so x−y=6. Add x+y=38 and x−y=6: 2x=44, hence x=22. Then y=38−22=16. Since 22 is greater than 16, the larger number is 22. Verification gives 2(22)+3(16)=92 and 3(22)+2(16)=98. Option A is the smaller number; 18 and 20 do not satisfy the required sum and difference. The key idea is to form simple equations for x+y and x−y.

Related tags

Linear EquationsElimination MethodWord ProblemComparison Of NumbersAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematics

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