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The question asks you to "Select the number of mm of rain required to fall on the roof covering (rounded to nearest m²) to fill the water tank (rounded to nearest 1,000 liters)." The choices provided are:

- a) 400 mm
- b) 431 mm
- c) 417 mm
- d) 415 mm

To calculate the number of millimeters of rain required to fill the tank, you need to consider a few things:
1. The capacity of the tank in liters.
2. The roof area over which the rain will fall (this converts rainfall in mm to liters).

If you provide these values (tank capacity and roof area), I can calculate the correct answer for you.

Would you like to provide more details, or should I explain further how the calculation is done?

Here are some related questions that might expand your understanding:
1. How do you convert millimeters of rainfall to liters over a certain area?
2. What is the formula to calculate rainfall required to fill a tank?
3. How does rounding affect this kind of calculation?
4. What is the difference between mm of rainfall and volume of water in liters?
5. How do you estimate water usage or storage based on rainfall?

**Tip:** Always ensure to use consistent units (like square meters for area and millimeters for rainfall depth) when converting rainfall to volume.

Select the number of mm of rain required to fall on the roof covering (rounded to nearest m²) to fill the water tank (rounded to nearest 1,000 liters).

Learn how to calculate the number of millimeters of rain required to fill a water tank based on roof area. This problem involves concepts like volume calculation and unit conversion, perfect for students in Grades 9-12.

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