Math Problem Statement

) You're helping your friends plan a birthday party, and they want to fill a small inflatable pool with water. The pool is shaped like a rectangular prism, measuring 6 feet long, 4 feet wide, and 2 feet high.

a) What is the volume of the pool in cubic feet?

b) How many gallons of water will be needed to fill the pool?

c) A typical garden hose flow rate is usually between 9 and 17 gallons per minute. If we assume the average of these values, how long will it take to fill the pool? Use a unit of measurement that is reasonable and easily understandable to the reader.

Solution

Let's solve this step-by-step:

a) Volume of the pool in cubic feet:

The pool is shaped like a rectangular prism, so its volume can be found using the formula:

V=length×width×heightV = \text{length} \times \text{width} \times \text{height}

Given:

  • Length = 6 feet
  • Width = 4 feet
  • Height = 2 feet

Substituting these values:

V=6×4×2=48cubic feetV = 6 \times 4 \times 2 = 48 \, \text{cubic feet}

So, the volume of the pool is 48 cubic feet.


b) How many gallons of water will be needed to fill the pool?

We need to convert cubic feet to gallons. The conversion factor is:

1cubic foot=7.48gallons1 \, \text{cubic foot} = 7.48 \, \text{gallons}

Now, multiplying the volume of the pool by the conversion factor:

48cubic feet×7.48gallons/cubic foot=359.04gallons48 \, \text{cubic feet} \times 7.48 \, \text{gallons/cubic foot} = 359.04 \, \text{gallons}

So, approximately 359 gallons of water will be needed to fill the pool.


c) How long will it take to fill the pool?

We are given that the flow rate of a garden hose is between 9 and 17 gallons per minute. We'll use the average of these values:

Average flow rate=9+172=13gallons per minute\text{Average flow rate} = \frac{9 + 17}{2} = 13 \, \text{gallons per minute}

Now, we calculate the time required to fill the pool:

Time=Total gallonsFlow rate=359gallons13gallons per minute27.6minutes\text{Time} = \frac{\text{Total gallons}}{\text{Flow rate}} = \frac{359 \, \text{gallons}}{13 \, \text{gallons per minute}} \approx 27.6 \, \text{minutes}

Thus, it will take approximately 28 minutes to fill the pool.


If you have any questions or need more details, feel free to ask!

Here are five related questions to expand the topic:

  1. How would the time change if the flow rate of the hose was increased to 20 gallons per minute?
  2. How many liters of water would the pool hold, given that 1 gallon = 3.785 liters?
  3. What would happen if the pool's height was doubled—how would the volume and fill time change?
  4. How much water would be needed if the pool was only filled to 75% of its capacity?
  5. How long would it take to fill a smaller pool with dimensions 4 feet by 3 feet by 1.5 feet?

Tip: Always remember to check the units of measurement, especially when converting between systems (like feet to gallons or minutes to seconds). It ensures accurate results!

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Math Problem Analysis

Mathematical Concepts

Geometry
Volume Calculation
Unit Conversion
Rates

Formulas

Volume of a rectangular prism: V = length × width × height
Cubic feet to gallons conversion: 1 cubic foot = 7.48 gallons
Time to fill = Total gallons / Flow rate

Theorems

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Suitable Grade Level

Grades 6-8