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Reena has 120 rupees. She buys pens at 15 rupees each and wants to save at least 30 rupees. What is the maximum number of pens she can buy?

Answer and explanation

Correct answer: 6

Let the number of pens be x. The remaining money is \(120-15x\), and the saving condition gives \(120-15x\geq 30\). Thus, \(-15x\geq -90\), so \(x\leq 6\). Since the number of pens must be a whole number, the maximum is 6. Buying 7 pens would leave only 15 rupees, which is less than the required 30 rupees. Exam tip: When an inequality is divided by a negative number, its sign is reversed.

Related tags

Linear InequalitiesWord ProblemsInteger SolutionsAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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