Math Problem Statement

The perimeter of a rectangle is 320 inches. Find the length and width if the length is an odd integer and the width is 5 times the next consecutive odd integer.

Solution

We are given that the perimeter of a rectangle is 320 inches. The perimeter PP of a rectangle is calculated as:

P=2×(L+W)P = 2 \times (L + W)

where LL is the length and WW is the width. We are also given the following conditions:

  1. The length LL is an odd integer.
  2. The width WW is 5 times the next consecutive odd integer after the length.

Step 1: Express the width in terms of the length

Let the length L=xL = x, where xx is an odd integer. The next consecutive odd integer is x+2x + 2. Therefore, the width is:

W=5×(x+2)W = 5 \times (x + 2)

Step 2: Substitute into the perimeter formula

Substitute L=xL = x and W=5×(x+2)W = 5 \times (x + 2) into the perimeter formula:

320=2×(x+5(x+2))320 = 2 \times \left( x + 5(x + 2) \right)

Step 3: Simplify the equation

Simplify the equation inside the parentheses:

320=2×(x+5x+10)320 = 2 \times \left( x + 5x + 10 \right) 320=2×(6x+10)320 = 2 \times (6x + 10) 320=12x+20320 = 12x + 20

Step 4: Solve for xx

Now, solve for xx:

32020=12x320 - 20 = 12x 300=12x300 = 12x x=30012=25x = \frac{300}{12} = 25

So, the length L=25L = 25.

Step 5: Find the width

Now, substitute x=25x = 25 back into the expression for the width:

W=5×(25+2)=5×27=135W = 5 \times (25 + 2) = 5 \times 27 = 135

Final Answer:

The length of the rectangle is 25 inches, and the width is 135 inches.

Would you like more details or have any questions?

Here are 5 related questions:

  1. How do we confirm if the perimeter condition is satisfied?
  2. Can the length and width be fractional values in this scenario?
  3. What happens if the perimeter was increased to 500 inches with the same conditions?
  4. How would the solution change if the width were 4 times the next consecutive even integer?
  5. Can you express the relationship between the length and width as a function of the perimeter?

Tip: In problems involving integer constraints, it helps to work systematically with consecutive integers or functions of those integers.

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Math Problem Analysis

Mathematical Concepts

Algebra
Geometry
Linear Equations
Odd Integers

Formulas

Perimeter of a rectangle: P = 2(L + W)

Theorems

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Suitable Grade Level

Grades 6-8