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What is the solution of 1 < (x − 2)/3 ≤ 4?

Answer and explanation

Correct answer: 5 < x ≤ 14

The governing concept is transforming a compound inequality while preserving strict and non-strict endpoints. Begin with 1 < (x − 2)/3 ≤ 4. Multiply all three parts by 3. Because 3 is positive, the signs remain unchanged: 3 < x − 2 ≤ 12. Add 2 throughout to get 5 < x ≤ 14. Thus option A is correct. Notice that 5 is excluded because the first original sign was <, whereas 14 is included because the second original sign was ≤. Option B reverses which endpoint is included, option C omits all values between 5 and 14, and option D gives the wrong direction and range. In interval notation the answer is (5, 14], which clearly reflects the open left endpoint and closed right endpoint.

Related tags

Compound InequalityLinear InequalityInterval NotationFractionAlgebraic Solution Of Linear Inequalities In One VariableLinear InequalitiesMathematicsClass 11 Mcq

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