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The problem states:

- It takes **20 litres of water** to cover **1 square meter** with **2 centimeters** of water.
- The field measures **20 meters by 30 meters** and should be covered with **4 centimeters** of water.
- Each bucket contains **10 liters**.

We need to determine how many buckets of water are required.

### Step-by-Step Solution:

1. **Calculate the area of the field:**
   \[
   \text{Area} = 20 \times 30 = 600 \, \text{square meters}
   \]

2. **Determine the volume of water needed for the required depth of 4 cm:**

   Since 20 liters of water covers 1 square meter with 2 cm of water, the volume needed for 4 cm (which is twice 2 cm) is:
   \[
   40 \, \text{liters per square meter}
   \]

3. **Calculate the total volume of water for the field:**
   \[
   \text{Total volume} = 600 \times 40 = 24,000 \, \text{liters}
   \]

4. **Determine the number of buckets needed:**

   Since each bucket holds 10 liters:
   \[
   \text{Number of buckets} = \frac{24,000}{10} = 2,400
   \]

Thus, the number of buckets required is **B. 2400**.

Would you like a further breakdown or have any questions?

### Related questions:
1. How much water is needed to cover the same field if the depth is 6 cm?
2. What would be the total volume of water if the field was 10 meters by 10 meters with 5 cm depth?
3. How many buckets of water are required if each bucket holds 15 liters instead of 10 liters?
4. What would be the total water volume required for a 50 by 20 meter field with a depth of 3 cm?
5. How would the number of buckets change if the depth of water was only 1 cm?

### Tip:
When dealing with problems involving volume and area, always keep track of the units and conversion factors to avoid errors.

It takes 20 litres of water to cover one square meter with 2 centimetres of water. Approximately, how many buckets of water do you need to cover a field with the measures 20 by 30 metres with 4 centimetres of water, if each bucket contains around 10 litres?

Learn how to calculate the number of buckets needed to cover a 20m x 30m field with 4 cm of water, using unit conversions and area calculations. This problem is suitable for students in Grades 5-7 and involves water volume estimation.

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