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A student practised for x days and solved x + 3 questions each day. If the student solved 130 questions in total, for how many days did the student practise?

Answer and explanation

Correct answer: 10 दिन

The total is the number of days multiplied by the questions solved each day, so x(x + 3) = 130. This gives x² + 3x − 130 = 0 = (x + 13)(x − 10), whose roots are −13 and 10. Since a number of days cannot be negative, the student practised for 10 days.

Related tags

Quadratic EquationsWord ProblemsWord Problems And ApplicationsMathematicsClass 10 Mcq

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