Math Problem Statement

The length of a rectangle is five inches more than twice the width. The perimeter is 34 inches. Find the length and width.

Solution

Let the width of the rectangle be denoted by ww, and the length be denoted by ll.

Step 1: Express the relationship between length and width

We are given that the length is five inches more than twice the width, so: l=2w+5l = 2w + 5

Step 2: Express the perimeter formula

The perimeter PP of a rectangle is given by the formula: P=2l+2wP = 2l + 2w We are told that the perimeter is 34 inches, so: 2l+2w=342l + 2w = 34

Step 3: Substitute the expression for ll

From step 1, we have l=2w+5l = 2w + 5. Substitute this into the perimeter equation: 2(2w+5)+2w=342(2w + 5) + 2w = 34

Step 4: Simplify and solve for ww

Expand the equation: 4w+10+2w=344w + 10 + 2w = 34 Combine like terms: 6w+10=346w + 10 = 34 Subtract 10 from both sides: 6w=246w = 24 Divide both sides by 6: w=4w = 4

Step 5: Solve for ll

Now that we know w=4w = 4, substitute this back into the expression for ll: l=2(4)+5=8+5=13l = 2(4) + 5 = 8 + 5 = 13

Final Answer:

  • Width = 4 inches
  • Length = 13 inches

Would you like more details, or do you have any questions?


Here are 5 related questions you might want to explore:

  1. What would the dimensions be if the perimeter were 40 inches?
  2. How would the problem change if the length was three times the width instead?
  3. What is the area of the rectangle with these dimensions?
  4. Can you find the diagonal of the rectangle using the Pythagorean theorem?
  5. What would happen if the perimeter were halved?

Tip: For any rectangle, once you know the length and width, you can easily compute its area by multiplying the two values together.

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Math Problem Analysis

Mathematical Concepts

Algebra
Geometry
Linear Equations

Formulas

Perimeter of a rectangle P = 2l + 2w
Linear relationship l = 2w + 5

Theorems

Perimeter formula of a rectangle

Suitable Grade Level

Grades 6-8