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The document you've uploaded appears to be in Greek and discusses housing data, specifically in New Zealand (Νέα Ζηλανδία) for different age groups. The main points include:

1. In 2014, the average size of a house in New Zealand was 60 square meters.
2. Between 2014 and 2016, this size decreased by 5% annually.
3. By 2016, there were approximately 1.2 million people aged 18-34, 1.8 million people aged 35-64, and 0.9 million people aged 65+ in New Zealand.
4. The problem asks to calculate the total surface area of all houses in New Zealand in 2016, assuming each person owns exactly one house.

The table beneath lists the percentage of homeownership by age group (18-34, 35-64, 65+) across various countries, including New Zealand, where homeownership percentages are:
- 32% for ages 18-34,
- 75% for ages 35-64,
- 78% for ages 65+.

Would you like a detailed explanation on how to calculate the total surface area for New Zealand in 2016 using this information? Or do you have any specific questions? 

### 5 Related Questions:
1. How do I calculate the number of homeowners for each age group in New Zealand?
2. How do I account for the 5% annual decrease in house size between 2014 and 2016?
3. What is the formula to find the total surface area of all homes in 2016?
4. How does New Zealand compare to other countries in terms of homeownership by age group?
5. How does the average home size in 2016 affect the total surface area calculation?

### Tip:
When dealing with percentage decreases over time, applying the compound decrease formula \( P(t) = P_0 \times (1 - r)^t \) can help track size reductions year by year.

What is the total surface area of all houses in New Zealand in 2016, assuming each person owns exactly one house?

This page covers how to calculate the total surface area of homes in New Zealand in 2016, given the average house size, population by age group, and homeownership percentages. Learn how to apply exponential decay and percentage calculations for a practical real-world problem. Suitable for Grades 10-12.

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