Nathaniel made note of all the bicycles and cars he could see parked or locked on a certain city block. All the cars had exactly four wheels, and all the bicycles had exactly two wheels. How many wheels were on the block if there were 15 bicycles and 3 cars? How many wheels were on the block if there were xx bicycles and yy cars?

To solve these problems, we'll break down the information step by step.

### 1. **Fixed Number of Bicycles and Cars:**
- **Bicycles:** 15 bicycles, each with 2 wheels.
- **Cars:** 3 cars, each with 4 wheels.

**Total wheels on the block:**
- Wheels from bicycles: \( 15 \times 2 = 30 \) wheels.
- Wheels from cars: \( 3 \times 4 = 12 \) wheels.

**Total number of wheels on the block:**
\[
30 \text{ (bicycle wheels)} + 12 \text{ (car wheels)} = 42 \text{ wheels}
\]

So, there are 42 wheels on the block with 15 bicycles and 3 cars.

### 2. **General Case with \(xx\) Bicycles and \(yy\) Cars:**
- **Bicycles:** \( xx \) bicycles, each with 2 wheels.
- **Cars:** \( yy \) cars, each with 4 wheels.

**Total wheels on the block:**
- Wheels from bicycles: \( xx \times 2 = 2xx \) wheels.
- Wheels from cars: \( yy \times 4 = 4yy \) wheels.

**Total number of wheels on the block:**
\[
2xx + 4yy \text{ wheels}
\]

So, the general formula for the total number of wheels on the block with \(xx\) bicycles and \(yy\) cars is \( 2xx + 4yy \) wheels.

Would you like a more detailed explanation or have any questions?

### Related Questions:
1. If there were 20 bicycles and 5 cars, how many wheels would there be?
2. If Nathaniel sees 10 bicycles and 7 cars, what is the total number of wheels?
3. How many wheels are there if \(xx = 12\) and \(yy = 9\)?
4. What would be the total number of wheels if Nathaniel doubled the number of bicycles?
5. How many bicycles would Nathaniel need to see to equal the number of wheels from 6 cars?

**Tip:** Remember, in problems like this, identifying the number of items and their individual properties (like wheels) allows for quick calculation by multiplication and addition.

Learn how to calculate the total number of wheels on a block with a given number of bicycles and cars. This problem covers basic arithmetic and algebraic concepts, suitable for students in Grades 4-6. Understand the steps to find the total wheels when there are 15 bicycles and 3 cars, as well as a general formula for any number of bicycles and cars.

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