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 $60$ hours, the second machine can be used for most for $40$ 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

Select Your Answer (Keyboard: A, B, C, D)
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Correct Answer

✅ Option c — $2x+y \le 60 \text{ and } x+2y \le 40$

All Options:

  • A$2x+y \le 60 \text{ and } x+y \le 40$
  • B$2x+y \ge 60 \text{ and } x+y \ge 40$
  • C$2x+y \le 60 \text{ and } x+2y \le 40$
  • D$2x+y \ge 60 \text{ and } x+2y \ge 40$

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 . The machine can be used for *at most* $60 hours:
2x+y≤602x + y ≤\displaystyle \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* $40$ hours:
x+2y≤40x + 2y ≤\displaystyle \le 40
3) **Non-negativity Constraints:** The production amounts cannot be negative:
x≥0,y≥0x ≥\displaystyle \ge 0, y ≥\displaystyle \ge 0

Combining these gives the system:
2x+y≤60andx+2y≤402x + y ≤\displaystyle \le 60 \quad and\displaystyle \text{and} \quad x + 2y ≤\displaystyle \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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