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What is the solution of the inequality (x + 2)/3 < 5?

Answer and explanation

Correct answer: x < 13

The governing concept is clearing a positive denominator in a linear inequality. Starting with (x + 2)/3 < 5, multiply both sides by 3. Because 3 is positive, the inequality direction remains unchanged: x + 2 < 15. Subtracting 2 from both sides gives x < 13. The endpoint 13 is excluded because the original relation is strict, <, rather than ≤. Substitution makes this clear: x = 12 gives 14/3 < 5, which is true, whereas x = 13 gives 15/3 = 5, which is not strictly less than 5. Options B and D reverse the direction without justification, and option C incorrectly includes the endpoint. The denominator is a fixed positive number, so no sign reversal occurs. Therefore option A is the complete solution.

Related tags

Linear InequalitiesFractional InequalityPositive DenominatorAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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