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Solve the inequality (x − 8)/5 ≥ (2x + 1)/3 − 4.

Answer and explanation

Correct answer: x ≤ 31/7

The correct solution is obtained by clearing the positive denominators. Multiply both sides by 15, the least common multiple of 5 and 3; because 15 is positive, the inequality direction stays the same: 3(x − 8) ≥ 5(2x + 1) − 60. Expanding gives 3x − 24 ≥ 10x + 5 − 60 = 10x − 55. Add 55 to both sides: 3x + 31 ≥ 10x. Subtract 3x: 31 ≥ 7x. Dividing by positive 7 yields x ≤ 31/7. Thus option A is correct. The supplied original option text showing 47/7 was inconsistent with the algebra, so it has been corrected here to 31/7. Options B and D reverse the direction, while C wrongly changes the inclusive endpoint to a strict one.

Related tags

Linear InequalitiesFractionsOne VariableAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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