https://file.aiquickdraw.com/mathbot/file/1727109643421g3qqnw1q.jpg

The problem involves finding the next day when all three schedules align after starting on Wednesday:

1. **Riska's schedule:** every 5 days.
2. **Rani's schedule:** every 4 days.
3. **Kamila's schedule:** every 2 days.

To find when they all meet again, we need the Least Common Multiple (LCM) of 5, 4, and 2.

- **Prime factorization:**
  - 5: \(5^1\)
  - 4: \(2^2\)
  - 2: \(2^1\)

- **LCM calculation:**
  - Take the highest powers of each prime factor: \(5^1\) and \(2^2\).
  - LCM = \( 5 \times 4 = 20 \).

This means they will meet again in 20 days.

Starting from Wednesday and adding 20 days, they will meet again on:

- **Wednesday + 20 days = Tuesday.**

So, the answer is **B. Selasa (Tuesday)**.

Would you like further details on the calculations, or do you have any other questions?

### Related Questions:
1. How do you calculate the LCM of more than two numbers?
2. Why is LCM important in scheduling problems?
3. What other real-world applications use LCM?
4. How can you quickly find the LCM of small numbers?
5. What is the difference between LCM and GCD?

**Tip:** Always start by finding the prime factors when calculating LCM for multiple numbers.

Jadwal les matematika untuk Riska adalah setiap 5 hari sekali, jadwal les matematika untuk Rani adalah setiap 4 hari sekali, sedangkan jadwal les matematika untuk Kamila adalah setiap 2 hari sekali. Jika hari Rabu mereka les matematika bersama, mereka akan les matematika bersama-sama kembali pada hari ....

Determine the next common day when Riska, Rani, and Kamila will have their math lessons together by calculating the Least Common Multiple (LCM) of 5, 4, and 2. A simple scheduling problem ideal for Grades 5-7 students.

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