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The image you uploaded shows a problem related to fluid dynamics and a rectangular tank design, but the text is slightly difficult to read. Based on the visible content, I can assist you with the setup and solution if I describe the problem for clarity:

1. **Airflow reduction problem**: Air flows through a duct, and the airflow reduces from 2,100 cubic feet per minute (CFM) to 1,640 CFM. You are asked to calculate the percentage drop in airflow.

2. **Rectangular tank design problem**: A rectangular tank has internal dimensions of 78.8 ft x 91 ft, and there is a catwalk shown inside the tank. You are asked to calculate the height at which the walkway should be placed, given that it should remain 2 ft above the liquid level at all times.

Let’s tackle these one by one. If you'd like, I can provide detailed steps for solving each, including relevant formulas. Would you like to start with the airflow problem or the tank design question?

Air flows through a duct at 2,100 cubic feet per minute (CFM), and the airflow decreases to 1,640 CFM. What is the percent drop in airflow? Also, a rectangular tank with internal dimensions of 78.8 ft x 91 ft is designed with a catwalk inside. Calculate the height of the walkway, which should remain 2 feet above the liquid level at all times.

Solve a real-world problem involving a reduction in airflow from 2,100 CFM to 1,640 CFM, calculating the percentage drop. Additionally, calculate the correct walkway height in a rectangular tank, ensuring it's 2 feet above the liquid level. This problem is suitable for high school students.

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