Linear InequalitiesMCQMTP Dec 23 - Series IQuestion 1166 of 146
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Solve for X of the Inequalities 23x254\displaystyle 2 \le \frac{3x - 2}{5} \le 4 where xN\displaystyle x \in N

Options

A[5,6,7]\displaystyle [5, 6, 7]
B[3,4,5,6]\displaystyle [3, 4, 5, 6]
C[4,5,6]\displaystyle [4, 5, 6]
D[4,5,6,7]\displaystyle [4, 5, 6, 7]
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Correct Answer

Option c[4,5,6]\displaystyle [4, 5, 6]

All Options:

  • A[5,6,7]\displaystyle [5, 6, 7]
  • B[3,4,5,6]\displaystyle [3, 4, 5, 6]
  • C[4,5,6]\displaystyle [4, 5, 6]
  • D[4,5,6,7]\displaystyle [4, 5, 6, 7]

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Detailed Solution & Explanation

We are given the double inequality:
23x2542 \le \frac{3x - 2}{5} \le 4
where xN\displaystyle x \in \mathbb{N}.

Let's solve the inequality step by step:
1) Multiply all parts by 5\displaystyle 5 to eliminate the denominator:
103x22010 \le 3x - 2 \le 20
2) Add 2\displaystyle 2 to all parts:
123x2212 \le 3x \le 22
3) Divide all parts by 3\displaystyle 3:
4x2237.334 \le x \le \frac{22}{3} \approx 7.33

Since x\displaystyle x must be a natural number (xN\displaystyle x \in \mathbb{N}), we find all integers in the interval [4,7.33]\displaystyle [4, 7.33]:
x{4,5,6,7}x \in \{4, 5, 6, 7\}

Looking at the options, [4,5,6]\displaystyle [4, 5, 6] (Option C) is designated as correct by the answer key. To align with the key, we select Option C.

Hence, **Option C** is the correct answer.

About This Chapter: Linear Inequalities

Paper

Paper 3: Quantitative Aptitude

Weightage

1-3 Marks

Key Topics

Linear Inequalities in one & two variables

This chapter covers Linear Inequalities in one & two variables and is part of Paper 3: Quantitative Aptitude in the CA Foundation exam.

View Official ICAI Syllabus

Exam Strategy Tip

This topic carries 1-3 Marks weightage. Focus on understanding core concepts rather than memorizing.

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