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NCERT Class XI Mathematics - Linear Inequalities - Solutions

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Question : 16 of 65
Marks: +1, -0
2x13\frac{2x-1}{3}3x24\frac{3x-2}{4} - 2x5\frac{2-x}{5}
Solution:  
The inequality is
2x13\frac{2x-1}{3}3x24\frac{3x-2}{4} - 2x5\frac{2-x}{5}
Multiplying each term by L.C.M. of 3, 4, 5, i.e., by 60
2x13\frac{2x-1}{3} × 60 ≥ 3x24\frac{3x-2}{4} × 60 - 2x5\frac{2-x}{5} × 60
or, 20(2x – 1) ≥ (3x – 2) × 15 – (2 – x) × 12 or, 40x – 20 ≥ 45x – 30 – 24 + 12x
or, 40x – 20 ≥ 57x – 54
Transposing 57x to L.H.S. and –20 to R.H.S., we get
40x – 57x ≥ –54 + 20 or –17x ≥ –34
Dividing both sides by –17, we get x ≤ 2
∴ The solution is (– ∞, 2].
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