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On the Dell River, a boat will pass the Colby drawbridge and then the Wave drawbridge. Rename each of the two drawbridge opening times.

1. Use 60 as a common denominator to express the opening times.
2. Rename each opening time using another common denominator.
3. Explain how you found your answers.

Opening times:

- Colby: [tex]\frac{3}{4}[/tex] hour
- Wave: [tex]\frac{1}{6}[/tex] hour

Calculations:

- Colby: [tex]\frac{3 \times 15}{4 \times 15} = \frac{45}{60}[/tex]
- Wave: [tex]\frac{1 \times 10}{6 \times 10} = \frac{10}{60}[/tex]

Common denominator for both:

- Colby: [tex]\frac{9 \times 5}{12 \times 5} = \frac{45}{60}[/tex]
- Wave: [tex]\frac{3 \times 10}{18 \times 10} = \frac{30}{60}[/tex]

Explanation:

The common denominator of 60 was used to express the opening times. Then, by finding another common denominator, I ensured the times are easily comparable.

| Dell River Drawbridge Openings |
|-------------------------------|
| Bridge Name | Time of Opening |
|-------------|-----------------|
| Asher Cross | On the hour |
| Colby | On the [tex]\frac{3}{4}[/tex] hour |
| Rainbow | On the [tex]\frac{2}{3}[/tex] hour |
| Red Bank | On the [tex]\frac{1}{4}[/tex] hour |
| Wave | On the [tex]\frac{1}{6}[/tex] hour |

Answer :

To solve the problem of renaming the opening times of the Colby and Wave drawbridges using different common denominators, let's go through the solution step by step:

1. Understanding the Problem:
- We have two drawbridges on the Dell River: the Colby and Wave drawbridges.
- Colby opens at [tex]\( \frac{3}{4} \)[/tex] of an hour.
- Wave opens at [tex]\( \frac{1}{6} \)[/tex] of an hour.

2. Using 60 as a Common Denominator:
- To express each opening time in terms of minutes using 60 as the common denominator (since there are 60 minutes in an hour):
- Colby Bridge:
[tex]\[ \frac{3}{4} \times 60 \text{ minutes} = 45 \text{ minutes} \][/tex]
- Wave Bridge:
[tex]\[ \frac{1}{6} \times 60 \text{ minutes} = 10 \text{ minutes} \][/tex]

3. Choosing Another Common Denominator:
- Let's use 12 as another common denominator to express these fractions.
- Convert each opening time using 12:
- Colby Bridge:
[tex]\[ \frac{3}{4} \times 12 = 9 \][/tex]
- This multiplication simplifies to saying: Colby opens 9 parts out of 12.
- Wave Bridge:
[tex]\[ \frac{1}{6} \times 12 = 2 \][/tex]
- This implies the Wave bridge opens 2 parts out of 12.

4. Conclusion:
- In terms of minutes, the Colby drawbridge opens at 45 minutes past the hour, and in terms of a fraction out of 12, it opens at 9/12 (75% of the hour).
- The Wave drawbridge opens at 10 minutes past the hour, and in terms of a fraction out of 12, it opens at 2/12 (16.67% of the hour).

By performing these conversions, we successfully renamed the opening times of the two drawbridges using the specified common denominators.

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Rewritten by : Barada