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The largest side of a triangle is 3 times the shortest side and third side is 4 cm shorter then largest side. If the perimeter of the triangle is at least 59 cm, what is the length of shortest side?

Chapter 2 Diagram

Options

ALess than 7 cm
B7 cm
CGreater than or equal to 7 cm
DGreater than or equal to 9 cm
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Correct Answer

Option dGreater than or equal to 9 cm

All Options:

  • ALess than 7 cm
  • B7 cm
  • CGreater than or equal to 7 cm
  • DGreater than or equal to 9 cm

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Detailed Solution & Explanation

Let the length of the shortest side of the triangle be x\displaystyle x cm.
From the given conditions:
- The largest side is 3 times the shortest side: 3x\displaystyle 3x cm.
- The third side is 4 cm shorter than the largest side: 3x4\displaystyle 3x - 4 cm.
The perimeter of the triangle is the sum of the lengths of its three sides:
Perimeter=x+3x+(3x4)=7x4\text{Perimeter} = x + 3x + (3x - 4) = 7x - 4
We are given that the perimeter is at least 59 cm:
7x4597x - 4 \ge 59
7x59+47x \ge 59 + 4
7x637x \ge 63
x9 cmx \ge 9\text{ cm}
Thus, the length of the shortest side must be greater than or equal to 9 cm.
**Correct Option: (d)**

About This Chapter: Equations

Paper

Paper 3: Quantitative Aptitude

Weightage

4-6 Marks

Key Topics

Linear, Quadratic and Cubic Equations

This chapter covers Linear, Quadratic and Cubic Equations and is part of Paper 3: Quantitative Aptitude in the CA Foundation exam.

View Official ICAI Syllabus

Exam Strategy Tip

This topic carries 4-6 Marks weightage. Focus on understanding core concepts rather than memorizing.

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