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The problem states:

1. Rama practices swimming every 3 days.
2. Nando practices every 7 days.
3. Both of them practiced together for the first time on September 15, 2012.

The question is asking when they will practice together again.

To solve this, we need to find the Least Common Multiple (LCM) of 3 and 7, which represents the number of days after which both Rama and Nando will practice together.

**Step-by-step solution:**

1. **Find the LCM of 3 and 7:**

   Since 3 and 7 are prime numbers, their LCM is their product:
   \[
   \text{LCM}(3, 7) = 3 \times 7 = 21
   \]

   This means that Rama and Nando will practice together every 21 days.

2. **Calculate the next practice date:**

   The first practice together is on September 15, 2012. To find the next date, add 21 days to this date.

   \[
   \text{September 15, 2012} + 21 \text{ days} = \text{October 6, 2012}
   \]

Therefore, Rama and Nando will practice together again on **October 6, 2012**.

Would you like more details or have any questions?

### Related Questions:
1. How do you calculate the LCM of two numbers?
2. How would the answer change if one of them practiced every 5 days instead?
3. How many times will they practice together in a year?
4. What are other practical examples where finding LCM is useful?
5. What if Rama had an irregular practice schedule, such as every 3 days for a month and then every 4 days the next month?

### Tip:
Finding the LCM is helpful in determining when two or more repeating events will coincide again.

Rama practices swimming every 3 days. Nando practices every 7 days. Both children practiced together for the first time on September 15, 2012. When will they practice together again?

Solve the problem of finding when Rama and Nando, who practice swimming every 3 and 7 days respectively, will practice together again after their first session on September 15, 2012. Learn how to use the Least Common Multiple (LCM) to calculate this.

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