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Mobile data remaining is 120 − 8x MB. If at least 40 MB should remain, what is the solution for x?

Answer and explanation

Correct answer: x ≤ 10

The phrase “at least 40 MB” translates into the inequality 120 − 8x ≥ 40. Subtract 120 from both sides: −8x ≥ −80. Dividing by −8 requires reversing the inequality sign, because division by a negative number reverses order; therefore x ≤ 10. Option B is correct. A practical check confirms it: if x = 10, the remaining data is 120 − 80 = 40 MB, so equality is allowed. If x = 8, 56 MB remains, also satisfying the condition. Option A reverses the direction and would permit too much usage, option C wrongly excludes x = 10, and option D results from an incorrect calculation. In a real context x may also represent a nonnegative quantity, but among the given choices the required inequality is x ≤ 10.

Related tags

Linear InequalitiesWord ProblemSign ReversalAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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