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### Problem Summary:
Anita records in a table the number of water bottles she buys and the amount of money she pays. The problem asks how many bottles she can buy with 21 soles.

### Given Data:
- **Bottles (units)**: 4, 12, 7, 20
- **Money Paid (soles)**: 6, 18, 10.5, 30

### Step 1: Determine the Cost per Bottle
To find the cost per bottle, we can calculate the ratio of money paid to the number of bottles in each case:

\[
\text{Cost per bottle} = \frac{\text{Money Paid}}{\text{Number of Bottles}}
\]

Let's calculate the cost per bottle for each pair of values in the table:

1. For 4 bottles and 6 soles:  
   \[
   \text{Cost per bottle} = \frac{6}{4} = 1.5 \text{ soles}
   \]

2. For 12 bottles and 18 soles:  
   \[
   \text{Cost per bottle} = \frac{18}{12} = 1.5 \text{ soles}
   \]

3. For 7 bottles and 10.5 soles:  
   \[
   \text{Cost per bottle} = \frac{10.5}{7} = 1.5 \text{ soles}
   \]

4. For 20 bottles and 30 soles:  
   \[
   \text{Cost per bottle} = \frac{30}{20} = 1.5 \text{ soles}
   \]

### Conclusion:
The cost per bottle is consistent at **1.5 soles per bottle**.

### Step 2: Determine the Number of Bottles Anita Can Buy with 21 Soles
To find out how many bottles Anita can buy with 21 soles, we use the following equation:

\[
\text{Number of Bottles} = \frac{\text{Total Money}}{\text{Cost per Bottle}}
\]

Substitute the given values:

\[
\text{Number of Bottles} = \frac{21}{1.5} = 14 \text{ bottles}
\]

### Answer:
Anita can buy **14 bottles** with 21 soles.

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

### Related Questions:
1. How many bottles can Anita buy with 45 soles?
2. If the price per bottle increases to 2 soles, how many bottles can Anita buy with 21 soles?
3. What is the total cost if Anita decides to buy 25 bottles?
4. How many bottles can Anita buy if she only has 12 soles?
5. What is the minimum amount of money needed to buy 10 bottles?

### Tip:
When dealing with proportional relationships like price per unit, always ensure that the ratio remains consistent across all given data points before making any generalizations.

Learn how to calculate the number of bottles Anita can buy with 21 soles using proportional relationships. This problem involves determining the cost per bottle and using division to find the number of bottles. Suitable for students in Grades 4-6.

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