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The problem from the image describes a renovation scenario involving a mix of sand, gravel, and cement in the ratio 5:7:3. Additionally, it mentions the need for iron, which is 150% of the cement weight, and asks to determine the required weight of gravel given that 225 kg of iron is available.

Let's break it down step by step:

1. **Iron Calculation**:  
   The problem states that the weight of iron is 150% of the weight of cement. This means:
   \[
   \text{Iron Weight} = 1.5 \times \text{Cement Weight}
   \]
   Given that the iron weight is 225 kg, we can find the cement weight by rearranging the formula:
   \[
   \text{Cement Weight} = \frac{\text{Iron Weight}}{1.5} = \frac{225}{1.5} = 150 \, \text{kg}
   \]

2. **Sand and Gravel Calculation**:  
   Now that we know the cement weight is 150 kg, we can use the ratio 5:7:3 for sand, gravel, and cement, respectively, to calculate the amounts of sand and gravel.
   
   - The weight of cement represents 3 parts of the ratio.
   - The weight of gravel represents 7 parts of the ratio.
   
   Therefore, the weight of gravel can be calculated as:
   \[
   \text{Gravel Weight} = \frac{7}{3} \times \text{Cement Weight} = \frac{7}{3} \times 150 = 350 \, \text{kg}
   \]

Thus, the weight of gravel that needs to be provided is **350 kg**.

Would you like further details or have any questions? Here are 5 related questions you might be interested in:

1. How would the result change if the ratio of sand, gravel, and cement was different?
2. How can we calculate the amount of sand in this scenario?
3. What would happen if the percentage of iron required was 200% instead of 150%?
4. How can this type of problem be represented using algebraic expressions?
5. How do we handle construction material proportions in large-scale renovations?

**Tip**: When dealing with ratios, always ensure to find the total parts of the ratio and use them to distribute the known quantities accurately.

Untuk menyelesaikan renovasi rumah, ayah perlu menyediakan pasir, batu, dan semen dengan perbandingan 5:7:3. Selain itu, ayah membutuhkan juga besi sebanyak 150% dari berat semen. Jika dibutuhkan 225 kg besi, berapa berat batu yang harus disediakan ayah?

Learn how to calculate the required amount of gravel for a house renovation based on the ratios of sand, gravel, and cement (5:7:3) and 150% of cement weight in iron. With 225 kg of iron available, this step-by-step solution walks through the calculation, perfect for students in Grades 7-9.

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