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NCERT Class XI Mathematics - Linear Inequalities - Solutions

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Question : 12 of 65
Marks: +1, -0
12(3x5+4)\frac{1}{2}\left(\frac{3x}{5}+4\right)13(x6)\frac{1}{3}(x-6)
Solution:  
The inequality is 12(3x5+4)\frac{1}{2}\left(\frac{3x}{5}+4\right)13(x6)\frac{1}{3}(x-6) or , 12(3x+205)\frac{1}{2}\left(\frac{3x+20}{5}\right)13(x6)\frac{1}{3}(x-6)
Multiplying both sides by 30,
3(3x + 20) ≥ 10(x – 6) or, 9x + 60 ≥ 10x – 60
Transposing 10x to L.H.S. and 60 to R.H.S., we get
∴ 9x – 10x ≥ – 60 – 60 or –x ≥ –120
Multiplying both sides by –1, we get x ≤ 120
∴ The solution is (–∞, 120].
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