Math Problem Statement

LeJuan swims in a pool that is similar to an Olympic-sized pool. LeJuan’s pool is 30 m long by 8 m wide. The length of an Olympic-sized pool is 50 m. To the nearest meter, what is the width of an Olympic-sized pool?

Solution

To determine the width of the Olympic-sized pool, we use the fact that the two pools are similar. Similarity means their corresponding dimensions are proportional.

Given Information:

  1. LeJuan's pool:
    • Length = 30 m
    • Width = 8 m
  2. Olympic-sized pool:
    • Length = 50 m
    • Width = unknown (let's call it xx)

Step 1: Set up the proportion

The ratio of the lengths of the two pools equals the ratio of their widths because the pools are similar:

Width of LeJuan’s poolLength of LeJuan’s pool=Width of Olympic-sized poolLength of Olympic-sized pool\frac{\text{Width of LeJuan's pool}}{\text{Length of LeJuan's pool}} = \frac{\text{Width of Olympic-sized pool}}{\text{Length of Olympic-sized pool}}

Substitute the known values:

830=x50\frac{8}{30} = \frac{x}{50}

Step 2: Solve for xx (width of the Olympic pool)

Cross-multiply to isolate xx:

850=30x8 \cdot 50 = 30 \cdot x

400=30x400 = 30x

Divide both sides by 30:

x=4003013.33x = \frac{400}{30} \approx 13.33

Step 3: Round to the nearest meter

To the nearest meter:

x13mx \approx 13 \, \text{m}

Final Answer:

The width of the Olympic-sized pool is approximately 13 meters.


Would you like a detailed explanation of why proportions work here? Let me know if you have any questions!

Related Questions:

  1. What are the dimensions of a standard Olympic-sized swimming pool?
  2. How do you determine if two shapes are similar?
  3. If LeJuan’s pool had a length of 40 m, what would its width be under the same proportion?
  4. Can you calculate the area of the Olympic-sized pool based on its dimensions?
  5. If LeJuan's pool and the Olympic-sized pool were squares instead, how would the problem change?

Tip: When solving proportions, always make sure corresponding parts match up (e.g., widths with widths and lengths with lengths).

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Math Problem Analysis

Mathematical Concepts

Ratios and Proportions
Similarity of Shapes
Linear Relationships

Formulas

(Width₁ / Length₁) = (Width₂ / Length₂)
Cross-Multiplication: a/b = c/d → ad = bc

Theorems

Proportionality Theorem for Similar Figures

Suitable Grade Level

Grades 6-8