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The difference between two positive numbers is 13 and their product is 558. What is the larger number?

Answer and explanation

Correct answer: 31

Let the smaller positive number be x. The larger number is then x + 13. Using the product condition, x(x + 13) = 558, so x² + 13x − 558 = 0. This factors as (x + 31)(x − 18) = 0, giving x = 18 or x = −31. Since both numbers are positive, x = 18 is the valid smaller number. Therefore the larger number is x + 13 = 31, and option C is correct. Option A is the smaller number rather than the requested larger one. Option B has difference 6 from 31 if paired appropriately and does not satisfy the product condition, while option D does not produce the given difference and product together.

Related tags

Quadratic-EquationsDifference-ProductNumber-ProblemWord Problems And ApplicationsQuadratic EquationsMathematicsClass 10 Mcq

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