Question 1: In a region with a total land area of 500 square kilometers, the government plans to allocate 40% of the land for residential purposes, 30% for commercial purposes, and the rest for public amenities and green spaces. How many square kilometers of land will be allocated for public amenities and green spaces?
Answer: To find the land area allocated for public amenities and green spaces, we need to subtract the areas allocated for residential and commercial purposes from the total land area.
Land area allocated for residential purposes = 40% of 500 square kilometers = 0.4 * 500 = 200 square kilometers. Land area allocated for commercial purposes = 30% of 500 square kilometers = 0.3 * 500 = 150 square kilometers.
Total land area allocated for residential and commercial purposes = 200 square kilometers + 150 square kilometers = 350 square kilometers.
Land area allocated for public amenities and green spaces = Total land area - Land area allocated for residential and commercial purposes Land area allocated for public amenities and green spaces = 500 square kilometers - 350 square kilometers = 150 square kilometers. Therefore, 150 square kilometers of land will be allocated for public amenities and green spaces in the region.
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Question 2: The population of a region is projected to grow at an average annual rate of 3%. If the current population of the region is 500,000, what will be the estimated population after 10 years?
Answer: To calculate the estimated population after 10 years, we can use the formula for compound interest:
Population after 10 years = Current population × (1 + Growth rate)^Number of years
Given: Current population = 500,000 Growth rate = 3% = 0.03 Number of years = 10
Population after 10 years = 500,000 × (1 + 0.03)^10
Using a calculator or spreadsheet, we can calculate: Population after 10 years ≈ 500,000 × (1.03)^10 ≈ 500,000 × 1.344036 ≈ 672,018
Therefore, the estimated population of the region after 10 years will be approximately 672,018.
Question 3: A city has a total area of 50 square kilometers. The city authorities plan to allocate 60% of the land for residential purposes, 25% for industrial purposes, and the remaining land for recreational areas. What will be the area allocated for recreational areas?
Answer: To find the area allocated for recreational areas, we need to subtract the areas allocated for residential and industrial purposes from the total area. Area allocated for residential purposes = 60% of 50 square kilometers = 0.6 * 50 = 30 square kilometers. Area allocated for industrial purposes = 25% of 50 square kilometers = 0.25 * 50 = 12.5 square kilometers.
Total area allocated for residential and industrial purposes = 30 square kilometers + 12.5 square kilometers = 42.5 square kilometers.
Area allocated for recreational areas = Total area - Area allocated for residential and industrial purposes Area allocated for recreational areas = 50 square kilometers - 42.5 square kilometers = 7.5 square kilometers.
Therefore, 7.5 square kilometers of land will be allocated for recreational areas in the city.
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Question 4: A regional transportation authority plans to construct a new highway. The estimated cost for the project is $500 million. If the authority receives funding from multiple sources, and they have secured 60% of the total cost from one source and 30% from another source, how much funding is still required?
Answer: To calculate the remaining funding required, we need to subtract the secured funding from the total cost of the project.
Total cost of the project = $500 million Funding secured from the first source = 60% of $500 million = 0.6 * $500 million = $300 million Funding secured from the second source = 30% of $500 million = 0.3 * $500 million = $150 million
Total secured funding = Funding secured from the first source + Funding secured from the second source Total secured funding = $300 million + $150 million = $450 million
Remaining funding required = Total cost of the project - Total secured funding
Remaining funding required = $500 million - $450 million = $50 million Therefore, an additional funding of $50 million is still required for the construction of the new highway.
Question 5: A city has a total population of 1 million, and the average household size is 4. If the city plans to build residential units to accommodate the entire population, how many residential units need to be constructed?
Answer: To calculate the number of residential units needed, we can divide the total population by the average household size.
Total population = 1 million Average household size = 4
Number of residential units needed = Total population / Average household size
Number of residential units needed = 1 million / 4 Number of residential units needed = 250,000
Therefore, 250,000 residential units need to be constructed to accommodate the entire population of 1 million in the city.