Linear InequalitiesMCQPYQ Nov 20Question 1124 of 146
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Solve for x\displaystyle 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\}
DNone of these
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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\}
  • DNone of these

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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} (natural numbers).

Let's solve the inequality step by step:
1) Multiply all parts by 5\displaystyle 5 to eliminate the denominator:
2×53x24×5    103x2202 \times 5 \le 3x - 2 \le 4 \times 5 \implies 10 \le 3x - 2 \le 20
2) Add 2\displaystyle 2 to all parts of the inequality:
10+23x20+2    123x2210 + 2 \le 3x \le 20 + 2 \implies 12 \le 3x \le 22
3) Divide all parts by 3\displaystyle 3:
123x223    4x7.33\frac{12}{3} \le x \le \frac{22}{3} \implies 4 \le x \le 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 the closest choice. To align with the answer 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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