Linear InequalitiesMCQMTP Nov 19Question 1143 of 146
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A company produces two products A and B, each of which requires processing in two machines. The first machine can be used for most for 60\displaystyle 60 hours, the second machine can be used for most for 40\displaystyle 40 hours. The product A requires 2\displaystyle 2 hours on machine one and one hour on machine two. The product B requires one hour on machine one and two hours on machine two. Express above situation using linear inequalities

Options

A2x+y60 and x+y40\displaystyle 2x+y \le 60 \text{ and } x+y \le 40
B2x+y60 and x+y40\displaystyle 2x+y \ge 60 \text{ and } x+y \ge 40
C2x+y60 and x+2y40\displaystyle 2x+y \le 60 \text{ and } x+2y \le 40
D2x+y60 and x+2y40\displaystyle 2x+y \ge 60 \text{ and } x+2y \ge 40
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Correct Answer

Option c2x+y60 and x+2y40\displaystyle 2x+y \le 60 \text{ and } x+2y \le 40

All Options:

  • A2x+y60 and x+y40\displaystyle 2x+y \le 60 \text{ and } x+y \le 40
  • B2x+y60 and x+y40\displaystyle 2x+y \ge 60 \text{ and } x+y \ge 40
  • C2x+y60 and x+2y40\displaystyle 2x+y \le 60 \text{ and } x+2y \le 40
  • D2x+y60 and x+2y40\displaystyle 2x+y \ge 60 \text{ and } x+2y \ge 40

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Detailed Solution & Explanation

Let x\displaystyle x be the number of units of Product A and y\displaystyle y be the number of units of Product B produced.

Let's formulate the inequalities for the two machines:
1) **Machine 1 Constraint:** Product A requires 2\displaystyle 2 hours and Product B requires 1\displaystyle 1 hour on Machine 1. The total time on Machine 1 is 2x+y\displaystyle 2x + y. The machine can be used for *at most* 60\displaystyle 60 hours:
2x+y602x + y \le 60
2) **Machine 2 Constraint:** Product A requires 1\displaystyle 1 hour and Product B requires 2\displaystyle 2 hours on Machine 2. The total time on Machine 2 is x+2y\displaystyle x + 2y. The machine can be used for *at most* 40\displaystyle 40 hours:
x+2y40x + 2y \le 40
3) **Non-negativity Constraints:** The production amounts cannot be negative:
x0,y0x \ge 0, y \ge 0

Combining these gives the system:
2x+y60andx+2y402x + y \le 60 \quad \text{and} \quad x + 2y \le 40

This corresponds to 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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