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MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
![**Solving a Word Problem with Three Unknowns Using a Linear Equation**
Carmen, Deandre, and Aldo served a total of 81 orders Monday at the school cafeteria. Carmen served 9 more orders than Aldo. Deandre served 2 times as many orders as Aldo. How many orders did they each serve?
**Variables:**
- Number of orders Carmen served: [ ]
- Number of orders Deandre served: [ ]
- Number of orders Aldo served: [ ]
**Steps to Solve:**
1. **Assign Variables:** Let \( x \) represent the number of orders Aldo served.
2. **Express Other Variables in Terms of \( x \):**
- Since Carmen served 9 more orders than Aldo, let Carmen’s orders be \( x + 9 \).
- Since Deandre served 2 times as many orders as Aldo, let Deandre’s orders be \( 2x \).
3. **Set Up the Equation:** The total number of orders served is given by the sum of the orders served by Carmen, Deandre, and Aldo, which equals 81.
\[
x + (x + 9) + 2x = 81
\]
4. **Combine Like Terms:**
\[
4x + 9 = 81
\]
5. **Solve for \( x \):**
\[
4x = 72 \\
x = 18
\]
6. **Substitute Back to Find Each Person’s Orders:**
- Aldo’s orders: \( x = 18 \)
- Carmen’s orders: \( x + 9 = 18 + 9 = 27 \)
- Deandre’s orders: \( 2x = 2 \times 18 = 36 \)
**Answers:**
- Number of orders Carmen served: 27
- Number of orders Deandre served: 36
- Number of orders Aldo served: 18
**Interactive Elements:**
[Explanation] [Check]
_This problem helps students understand how to translate word problems into algebraic expressions and equations, and then solve for the unknowns._
© 2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | [Explanation] [Check]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd2329ae5-bd80-4bde-acb1-3d6784c24ee9%2Fa1b09bc0-925f-44c0-b5c0-cc613ba6e36e%2Fnj76n0p_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Solving a Word Problem with Three Unknowns Using a Linear Equation**
Carmen, Deandre, and Aldo served a total of 81 orders Monday at the school cafeteria. Carmen served 9 more orders than Aldo. Deandre served 2 times as many orders as Aldo. How many orders did they each serve?
**Variables:**
- Number of orders Carmen served: [ ]
- Number of orders Deandre served: [ ]
- Number of orders Aldo served: [ ]
**Steps to Solve:**
1. **Assign Variables:** Let \( x \) represent the number of orders Aldo served.
2. **Express Other Variables in Terms of \( x \):**
- Since Carmen served 9 more orders than Aldo, let Carmen’s orders be \( x + 9 \).
- Since Deandre served 2 times as many orders as Aldo, let Deandre’s orders be \( 2x \).
3. **Set Up the Equation:** The total number of orders served is given by the sum of the orders served by Carmen, Deandre, and Aldo, which equals 81.
\[
x + (x + 9) + 2x = 81
\]
4. **Combine Like Terms:**
\[
4x + 9 = 81
\]
5. **Solve for \( x \):**
\[
4x = 72 \\
x = 18
\]
6. **Substitute Back to Find Each Person’s Orders:**
- Aldo’s orders: \( x = 18 \)
- Carmen’s orders: \( x + 9 = 18 + 9 = 27 \)
- Deandre’s orders: \( 2x = 2 \times 18 = 36 \)
**Answers:**
- Number of orders Carmen served: 27
- Number of orders Deandre served: 36
- Number of orders Aldo served: 18
**Interactive Elements:**
[Explanation] [Check]
_This problem helps students understand how to translate word problems into algebraic expressions and equations, and then solve for the unknowns._
© 2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | [Explanation] [Check]
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