Math Problem Statement

The perimeter of a rectangle is 40 inches. Find the length and width if the length is an integer and the width is 2 times the next consecutive integer.

Solution

Let's denote the length of the rectangle as LL and the width as WW.

Given:

  1. The perimeter of the rectangle is 40 inches.
  2. The width is 2 times the next consecutive integer after the length.

Step 1: Set up perimeter equation

The formula for the perimeter PP of a rectangle is: P=2L+2WP = 2L + 2W Since P=40P = 40: 2L+2W=402L + 2W = 40 Dividing both sides by 2: L+W=20L + W = 20

Step 2: Define WW in terms of LL

According to the problem, the width WW is "2 times the next consecutive integer." This means W=2(L+1)W = 2(L + 1).

Step 3: Substitute WW into the perimeter equation

Substitute W=2(L+1)W = 2(L + 1) into L+W=20L + W = 20: L+2(L+1)=20L + 2(L + 1) = 20 Expanding and simplifying: L+2L+2=20L + 2L + 2 = 20 3L=183L = 18 L=6L = 6

Step 4: Find WW

Now, substitute L=6L = 6 back into W=2(L+1)W = 2(L + 1): W=2(6+1)W = 2(6 + 1) W=2×7=14W = 2 \times 7 = 14

Solution

The length LL is 6 inches, and the width WW is 14 inches.

Verification

To confirm, check the perimeter: 2L+2W=2(6)+2(14)=12+28=402L + 2W = 2(6) + 2(14) = 12 + 28 = 40 Thus, the solution is correct.


Would you like further details or have any questions about this problem?

Related Questions

  1. What would the length and width be if the perimeter were 60 inches instead of 40?
  2. If the width were 3 times the next consecutive integer after the length, how would the dimensions change?
  3. How would you find the dimensions if the length is given as twice the width?
  4. What are the possible integer pairs for length and width if only the perimeter is known?
  5. How does this solution approach change if both length and width are unknown?

Tip: For perimeter problems, setting up clear equations based on the definitions can simplify solving for unknowns.

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Math Problem Analysis

Mathematical Concepts

Algebra
Geometry
Linear Equations

Formulas

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

Theorems

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Suitable Grade Level

Grades 6-8