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The sum of two positive numbers is 19 and their product is 84. Which pair of numbers satisfies these conditions?

Answer and explanation

Correct answer: 7 and 12

Let one number be x; then the other is 19 − x. Using the product condition, x(19 − x) = 84, which gives x² − 19x + 84 = 0. Factoring, (x − 7)(x − 12) = 0, so the numbers are 7 and 12. Option A has the correct sum but its product is 78, not 84. Exam tip: always verify both the sum and the product of the selected pair.

Related tags

Quadratic EquationsWord ProblemsSum And ProductWord Problems And ApplicationsMathematicsClass 10 Mcq

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