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The difference between two positive numbers is 5 and their product is 456. What is the larger number?

Answer and explanation

Correct answer: 24

Let the smaller positive number be x. Since the difference is 5, the larger number is x + 5. The product condition gives x(x + 5) = 456, which becomes x² + 5x − 456 = 0. Factoring yields (x − 19)(x + 24) = 0, so x = 19 or x = −24. The negative root is invalid because both numbers are positive. Thus the smaller number is 19 and the larger is 19 + 5 = 24. Direct verification gives 19 × 24 = 456 and 24 − 19 = 5. Therefore option C is correct. Option A identifies the smaller number, while 21 and 27 do not satisfy both the difference and product conditions simultaneously.

Related tags

Quadratic EquationsProduct And DifferenceNumber ProblemsWord Problems And ApplicationsMathematicsClass 10 Mcq

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