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Radha has x marks. If x + 12 ≥ 45, what is the minimum value of x?

Answer and explanation

Correct answer: 33

This word problem uses the boundary principle for a linear inequality. Starting with x + 12 ≥ 45, subtract 12 from both sides: x ≥ 45 − 12 = 33. The symbol ≥ includes equality, so x may be exactly 33 as well as any larger number. Therefore the minimum possible value is 33, making option A correct. The value 32 is too small because 32 + 12 = 44, which does not reach 45. The value 45 is allowed but is not the least possible value, and 57 is also larger than necessary. No reversal of the inequality occurs because only subtraction is performed, and subtracting the same number from both sides preserves the order.

Related tags

Linear InequalitiesWord ProblemMinimum ValueBoundary ValueAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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