The floor of a shed has an area of 104 square feet. The floor is in the shape of a rectangle whose length is 3 feet less than twice the width. We need to find the length and the width of the floor of the shed.

AlgebraWord ProblemQuadratic EquationsAreaRectangle
2025/3/25

1. Problem Description

The floor of a shed has an area of 104 square feet. The floor is in the shape of a rectangle whose length is 3 feet less than twice the width. We need to find the length and the width of the floor of the shed.

2. Solution Steps

Let ww be the width of the floor of the shed.
Let ll be the length of the floor of the shed.
The length is 3 feet less than twice the width, so we can write
l=2w3l = 2w - 3.
The area of the rectangular floor is given by
Area = length * width, so A=lwA = l * w.
We are given that the area is 104 square feet, so 104=lw104 = l * w.
Substituting l=2w3l = 2w - 3 into the area equation, we get
104=(2w3)w104 = (2w - 3)w.
Expanding the equation gives
104=2w23w104 = 2w^2 - 3w.
Rearranging the equation into a quadratic form, we have
2w23w104=02w^2 - 3w - 104 = 0.
We can solve this quadratic equation for ww using the quadratic formula:
w=b±b24ac2aw = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}, where a=2a = 2, b=3b = -3, and c=104c = -104.
w=3±(3)24(2)(104)2(2)w = \frac{3 \pm \sqrt{(-3)^2 - 4(2)(-104)}}{2(2)}
w=3±9+8324w = \frac{3 \pm \sqrt{9 + 832}}{4}
w=3±8414w = \frac{3 \pm \sqrt{841}}{4}
w=3±294w = \frac{3 \pm 29}{4}
We have two possible solutions for ww:
w=3+294=324=8w = \frac{3 + 29}{4} = \frac{32}{4} = 8
w=3294=264=6.5w = \frac{3 - 29}{4} = \frac{-26}{4} = -6.5
Since the width cannot be negative, we have w=8w = 8.
Now we can find the length using l=2w3l = 2w - 3:
l=2(8)3=163=13l = 2(8) - 3 = 16 - 3 = 13.
So the width is 8 feet and the length is 13 feet.
We can check our answer: 813=1048 * 13 = 104, which is the given area.

3. Final Answer

The width of the floor of the shed is 8 ft.
The length of the floor of the shed is 13 ft.

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