Calculus: Early Transcendentals
Calculus: Early Transcendentals
8th Edition
ISBN: 9781285741550
Author: James Stewart
Publisher: Cengage Learning
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### Problem Description

Three large tanks contain brine, as illustrated in the figure below.

**Tank A:**
- Capacity: 300 gallons
- Input: Pure water at a rate of 4 gallons per minute
- Outflow: Mixture at a rate of 4 gallons per minute to Tank B
- Salt concentration is denoted as \( x_1(t) \).

**Tank B:**
- Capacity: 150 gallons
- Inflow: Mixture from Tank A at a rate of 4 gallons per minute
- Outflow: Mixture at a rate of 4 gallons per minute to Tank C
- Salt concentration is denoted as \( x_2(t) \).

**Tank C:**
- Capacity: 100 gallons
- Inflow: Mixture from Tank B at a rate of 4 gallons per minute
- Outflow: Mixture at a rate of 4 gallons per minute
- Salt concentration is denoted as \( x_3(t) \).

### Task

Use the information in the figure to determine a system of first-order differential equations that describes the number of pounds of salt \( x_1(t) \), \( x_2(t) \), and \( x_3(t) \) at time \( t \) in tanks A, B, and C, respectively. It is not necessary to solve the system of differential equations.
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Transcribed Image Text:### Problem Description Three large tanks contain brine, as illustrated in the figure below. **Tank A:** - Capacity: 300 gallons - Input: Pure water at a rate of 4 gallons per minute - Outflow: Mixture at a rate of 4 gallons per minute to Tank B - Salt concentration is denoted as \( x_1(t) \). **Tank B:** - Capacity: 150 gallons - Inflow: Mixture from Tank A at a rate of 4 gallons per minute - Outflow: Mixture at a rate of 4 gallons per minute to Tank C - Salt concentration is denoted as \( x_2(t) \). **Tank C:** - Capacity: 100 gallons - Inflow: Mixture from Tank B at a rate of 4 gallons per minute - Outflow: Mixture at a rate of 4 gallons per minute - Salt concentration is denoted as \( x_3(t) \). ### Task Use the information in the figure to determine a system of first-order differential equations that describes the number of pounds of salt \( x_1(t) \), \( x_2(t) \), and \( x_3(t) \) at time \( t \) in tanks A, B, and C, respectively. It is not necessary to solve the system of differential equations.
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