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The problem can be solved by creating a system of equations based on the given information. Let's break it down step by step:

### Given:
- Pak Beni paid Rp. 225,000 for 3 adults and 3 children (below 15 years old).
- Pak Beni's brother paid Rp. 210,000 for 2 adults and 4 children (below 15 years old).

We need to find the price of 1 adult ticket.

### Step 1: Define Variables
Let:
- \( x \) be the price of an adult ticket.
- \( y \) be the price of a children's ticket.

### Step 2: Create Equations
From the information given, we can create two equations:

1. For Pak Beni's ticket purchase:
   \[
   3x + 3y = 225,000
   \]
2. For his brother's ticket purchase:
   \[
   2x + 4y = 210,000
   \]

### Step 3: Solve the System of Equations

1. First, simplify both equations if necessary:
   - Equation 1: \( 3x + 3y = 225,000 \)
   - Equation 2: \( 2x + 4y = 210,000 \)

2. Solve one equation for one variable and substitute into the other equation.

I'll now calculate the solution.The solution to the system of equations gives the following prices:
- The price of 1 adult ticket is **Rp. 45,000**.
- The price of 1 child ticket is **Rp. 30,000**.

Thus, the correct answer is **option B (Rp. 45,000)**.

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

Here are 5 related questions you could explore:
1. How would the answer change if the number of children or adults was different?
2. Can you solve a similar problem with more unknowns?
3. How can you verify the solution by substitution?
4. What other methods can you use to solve a system of equations like this?
5. How does increasing or decreasing one price affect the total cost?

**Tip**: When solving systems of equations, try using substitution or elimination methods depending on the structure of the equations.

Pak Beni akan mengajak keluarganya dan juga keluarga adiknya untuk pergi menonton bersama di bioskop tersebut. Pak Beni memesan tiket dan membayar sebesar Rp. 225.000,- untuk 3 orang dewasa dan 3 orang anak di bawah 15 tahun, sedangkan adik Pak Beni membayar pemesanan tiket sebesar Rp. 210.000,- untuk 2 orang dewasa dan 4 orang anak di bawah 15 tahun. Berapakah harga tiket bioskop tersebut untuk 1 orang dewasa?

This problem helps you learn how to calculate the price of an adult ticket using a system of linear equations. The total cost of tickets for adults and children is given, and you need to find the price for one adult. Suitable for students in grades 6-8.

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