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A student practised for x days and solved x + 7 questions each day. The student solved a total of 408 questions. For how many days did the student practise?

Answer and explanation

Correct answer: 17

The total number of questions gives the equation x(x + 7) = 408, or x² + 7x − 408 = 0. Factoring gives (x − 17)(x + 24) = 0, so x = 17 or x = −24. Since the number of days cannot be negative, x = 17 is the valid answer. As an exam tip, verify it by checking that 17 × 24 = 408.

Related tags

Quadratic EquationsWord ProblemsLinear FactorsArithmetic VerificationWord Problems And ApplicationsMathematicsClass 10 Mcq

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