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Solve the inequality (\frac{3x}{5}+2<\frac{x}{2}+7).

Answer and explanation

Correct answer: (x<50)

Direct answer: option D, \(x<50\). Multiply the whole inequality by the positive number 10, so its sign does not change: \(10(3x/5+2)<10(x/2+7)\). This gives \(6x+20<5x+70\). Subtract \(5x\): \(x+20<70\). Subtract 20: \(x<50\). Option D is exact. Option A has the inequality direction reversed. Option B uses \(\le\) instead of the required strict \(<\), so it incorrectly includes 50. Option C has an incorrect numerical result; substituting 25 does not mark the boundary. Because 10 is positive, no reversal occurs. Memory cue: reverse an inequality only when multiplying or dividing by a negative number.

Related tags

Linear InequalitiesFractionsLcm

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