Linear InequalitiesMCQMTP Dec 22 - Series IQuestion 1161 of 146
All Questions

The time required to produce a unit of product A is 3 hours and that for product B is 5 hours. The total usable time is 220 hours. If x and y are the no. of units of A and B that are produced then

Select Your Answer (Keyboard: A, B, C, D)
For any discrepancies in this question, email contact@cadada.in

Correct Answer

✅ Option c — $3x + 5y \le 220, x \le 0, y \le 0$

All Options:

  • A$3x + 5y = 220$
  • B$3x + 5y \le 220, x \ge 0, y \ge 0$
  • C$3x + 5y \le 220, x \le 0, y \le 0$
  • D$5x + 2y \le 220, x \ge 0, y \ge 0$

Detailed Solution & Explanation

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

Let's write the constraints:
1) Producing x\displaystyle x units of A takes $3x$ hours, and producing $y$ units of B takes $5y$ hours.
2) The total production time is $3x + 5y\displaystyle .<br>3) The total usable time is &#36;220 hours (meaning at most $220hourscanbeused):<br><spanclass="katex−display"><spanclass="katex"><spanclass="katex−mathml"><mathxmlns="http://www.w3.org/1998/Math/MathML"display="block"><semantics><mrow><mn>3</mn><mi>x</mi><mo>+</mo><mn>5</mn><mi>y</mi><mo>≤</mo><mn>220</mn></mrow><annotationencoding="application/x−tex">3x+5y≤220</annotation></semantics></math></span><spanclass="katex−html"aria−hidden="true"><spanclass="base"><spanclass="strut"style="height:0.7278em;vertical−align:−0.0833em;"></span><spanclass="mord">3</span><spanclass="mordmathnormal">x</span><spanclass="mspace"style="margin−right:0.2222em;"></span><spanclass="mbin">+</span><spanclass="mspace"style="margin−right:0.2222em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.8389em;vertical−align:−0.1944em;"></span><spanclass="mord">5</span><spanclass="mordmathnormal"style="margin−right:0.03588em;">y</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">≤</span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.6444em;"></span><spanclass="mord">220</span></span></span></span></span><br>4)Thenumberofunitscannotbenegative:<br><spanclass="katex−display"><spanclass="katex"><spanclass="katex−mathml"><mathxmlns="http://www.w3.org/1998/Math/MathML"display="block"><semantics><mrow><mi>x</mi><mo>≥</mo><mn>0</mn><moseparator="true">,</mo><mspacewidth="1em"/><mi>y</mi><mo>≥</mo><mn>0</mn></mrow><annotationencoding="application/x−tex">x≥0,y≥0</annotation></semantics></math></span><spanclass="katex−html"aria−hidden="true"><spanclass="base"><spanclass="strut"style="height:0.7719em;vertical−align:−0.136em;"></span><spanclass="mordmathnormal">x</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">≥</span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.8389em;vertical−align:−0.1944em;"></span><spanclass="mord">0</span><spanclass="mpunct">,</span><spanclass="mspace"style="margin−right:1em;"></span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mordmathnormal"style="margin−right:0.03588em;">y</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">≥</span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:0.6444em;"></span><spanclass="mord">0</span></span></span></span></span><br><br>SothemathematicallycorrectrepresentationisOptionB.However,theanswerkeydesignatesOptionC(where\displaystyle hours can be used):<br><span class="katex-display"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><semantics><mrow><mn>3</mn><mi>x</mi><mo>+</mo><mn>5</mn><mi>y</mi><mo>≤</mo><mn>220</mn></mrow><annotation encoding="application/x-tex">3x + 5y ≤\displaystyle \le 220</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.7278em;vertical-align:-0.0833em;"></span><span class="mord">3</span><span class="mord mathnormal">x</span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mbin">+</span><span class="mspace" style="margin-right:0.2222em;"></span></span><span class="base"><span class="strut" style="height:0.8389em;vertical-align:-0.1944em;"></span><span class="mord">5</span><span class="mord mathnormal" style="margin-right:0.03588em;">y</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">≤</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.6444em;"></span><span class="mord">220</span></span></span></span></span><br>4) The number of units cannot be negative:<br><span class="katex-display"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><semantics><mrow><mi>x</mi><mo>≥</mo><mn>0</mn><mo separator="true">,</mo><mspace width="1em"/><mi>y</mi><mo>≥</mo><mn>0</mn></mrow><annotation encoding="application/x-tex">x ≥\displaystyle \ge 0, \quad y ≥\displaystyle \ge 0</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.7719em;vertical-align:-0.136em;"></span><span class="mord mathnormal">x</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">≥</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.8389em;vertical-align:-0.1944em;"></span><span class="mord">0</span><span class="mpunct">,</span><span class="mspace" style="margin-right:1em;"></span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mord mathnormal" style="margin-right:0.03588em;">y</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">≥</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.6444em;"></span><span class="mord">0</span></span></span></span></span><br><br>So the mathematically correct representation is Option B. However, the answer key designates Option C (wherex ≤\displaystyle \le 0, y ≤\displaystyle \le 0$) as correct. 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.

More Questions from Linear Inequalities

Ready to Master Linear Inequalities?

Practice all 146 questions with instant feedback, earn XP, track your streaks, and ace your CA Foundation exam.

Start Practicing — It's Free