Tom has a backyard that is 100 ft by 60 ft.  He plans to install a rectangular swimming pool bordered by a concrete walkway of uniform width.  He wants the area of the pool to take up 1/2 of the area of the entire backyard.   Determine the width of the walkway (x). Round your answer to 2 decimals.   Enter answer in ft. 

Expert Answers

An illustration of the letter 'A' in a speech bubbles

First, solve for the total area of the backyard.


Hence, the total area of the backyard is `6000ft^2` .

Then, take half of it to get the area of the pool.


Hence, the area of the pool is `3000 ft^2` .

Also, if x is the width of the walkway, then the dimension of the pool are:



(See image for your reference.)

So, the area of the pool can be express as:


To solve for the value of x, plug-in value of area of pool.


Then expand right side.


Set left side equal to zero.


To simplify the equation further, divide both sides by 4.


Then, apply quadratic formula.





Consider only the value x=10.85, since the other value of x would result to a negative length and width of the swimming pool.

Therefore, the width of the walkway is 10.85 ft.

This image has been Flagged as inappropriate Click to unflag
Image (1 of 1)
Approved by eNotes Editorial Team

We’ll help your grades soar

Start your 48-hour free trial and unlock all the summaries, Q&A, and analyses you need to get better grades now.

  • 30,000+ book summaries
  • 20% study tools discount
  • Ad-free content
  • PDF downloads
  • 300,000+ answers
  • 5-star customer support
Start your 48-Hour Free Trial