Math Problem Statement

The length of a rectangle is 6 centimeters less than 5 times its width. The perimeter of the rectangle is 60 cm. What are the dimensions of the rectangle?

Solution

We are given the following information:

  • The length of the rectangle is 6 centimeters less than 5 times its width.
  • The perimeter of the rectangle is 60 cm.

Let the width of the rectangle be ww cm. Then the length of the rectangle is:

l=5w6cml = 5w - 6 \, \text{cm}

The formula for the perimeter PP of a rectangle is:

P=2(l+w)P = 2(l + w)

Substitute the given perimeter and the expression for the length into the formula:

60=2((5w6)+w)60 = 2((5w - 6) + w)

Simplifying:

60=2(6w6)60 = 2(6w - 6)

60=12w1260 = 12w - 12

Add 12 to both sides:

72=12w72 = 12w

Now, divide by 12:

w=6w = 6

Now that we have the width, we can find the length:

l=5(6)6=306=24l = 5(6) - 6 = 30 - 6 = 24

So, the dimensions of the rectangle are:

Width=6cm,Length=24cm\text{Width} = 6 \, \text{cm}, \, \text{Length} = 24 \, \text{cm}

In the required format, the answer is 6×246 \times 24.

Would you like further clarification on any part? Here are some related questions to explore:

  1. How would the dimensions change if the perimeter increased by 10 cm?
  2. What if the length was instead 8 cm less than 5 times the width?
  3. How can you find the area of the rectangle with these dimensions?
  4. Can you solve a similar problem where the relationship between length and width is different?
  5. What are other methods to calculate the dimensions of a rectangle given its perimeter and length-width relationship?

Tip: Always start by defining your variables and setting up the correct equation based on the given information.

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Math Problem Analysis

Mathematical Concepts

Algebra
Geometry
Linear Equations

Formulas

Perimeter of a rectangle: P = 2(l + w)
Expression for length: l = 5w - 6

Theorems

Linear equations
Basic algebraic manipulation

Suitable Grade Level

Grades 7-9