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The sum of the ages of two friends is 44 years and the product of their ages is 480 years². What is the age of the older friend?

Answer and explanation

Correct answer: 24 years

Let one friend’s age be x years. Then the other friend’s age is (44 − x) years. Thus, x(44 − x) = 480, giving x² − 44x + 480 = 0. Factoring, (x − 24)(x − 20) = 0, so the two ages are 24 years and 20 years. Therefore, the older friend is 24 years old. Exam tip: For such problems, form the quadratic equation from the given sum and product before solving it.

Related tags

Quadratic-EquationsWord-ProblemsAgesFactorisationWord Problems And ApplicationsQuadratic EquationsMathematicsClass 10 Mcq

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