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The problem asks to calculate the **lower bound** of the total mass of 10 bags of rice, where each bag's mass is stated to be **25 kg** correct to the nearest kilogram.

### Step-by-Step Solution:

1. **Determine the lower bound of a single bag:**
   - Since the mass is given as 25 kg correct to the nearest kilogram, the possible range for the mass of a single bag is:
     \[
     24.5 \, \text{kg} \leq \text{mass of one bag} < 25.5 \, \text{kg}
     \]
   - The **lower bound** of a single bag is therefore **24.5 kg**.

2. **Calculate the lower bound of the total mass for 10 bags:**
   - To find the lower bound of 10 bags, multiply the lower bound of one bag by 10:
     \[
     \text{Lower bound for 10 bags} = 24.5 \, \text{kg} \times 10 = 245 \, \text{kg}
     \]

Thus, the **lower bound of the total mass of 10 bags is 245 kg**.

Would you like more details on this, or do you have any questions?

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Here are 5 related questions to explore further:

1. What is the upper bound of the total mass of the 10 bags of rice?
2. How would the lower bound change if the number of bags increased to 20?
3. What is the significance of calculating upper and lower bounds in measurement?
4. How would the calculation change if the mass of each bag was accurate to the nearest 0.5 kg?
5. If one of the bags was damaged and had a lower mass, how would you estimate the total mass?

**Tip:** When rounding or approximating values, always consider the range of possible values, particularly when asked for bounds or limits.

A bag of rice has a mass of 25 kg, correct to the nearest kilogram. Calculate the lower bound of the total mass of 10 of these bags.

Learn how to calculate the lower bound of the total mass for 10 bags of rice, each weighing 25 kg to the nearest kilogram. This problem involves key concepts in estimation and measurement accuracy, suitable for students in Grades 8-10.

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