Q1. If a carbon footprint of a household is reduced by 15% each year, what will be the footprint after 2 years if the initial footprint is 2000 kg?
Solution:
After 1 year: 2000 - 0.15 * 2000 = 1700 kg. After 2 years: 1700 - 0.15 * 1700 = 1445 kg.
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Q2. A river's flow rate is measured at 500 cubic meters per second. How much water flows through the river in one hour?
Solution:
Water flow in one hour = 500 m³/s * 3600 s = 1,800,000 m³.
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Q3. If a certain species of bird migrates 1,200 kilometers in 3 weeks, what is the average distance it migrates per week?
Solution:
Average distance per week = 1200 km / 3 weeks = 400 km/week.
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Q4. A conservation area is designed to protect 150 species of plants. If 10% of these species are endangered, how many species are endangered?
Solution:
Endangered species = 10% of 150 = 0.1 * 150 = 15.
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Q5. If a forest covers 60% of a region and the area of the region is 500 square kilometers, what is the area covered by the forest?
Solution:
Area of the forest = 60% of 500 sq km = 0.6 * 500 = 300 sq km.
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Q6. A certain species of fish can reproduce every 3 months. If a single fish reproduces 20 offspring each time, how many fish will there be after 1 year assuming all offspring survive?
Solution:
In 1 year (12 months), there are 4 reproduction cycles. Total fish = 1 + 4 * 20 = 81.
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Q7. If a certain pollutant decreases in concentration by 25% each year, what will be the concentration after 2 years if the initial concentration is 160 mg/L?
Q8. A certain ecosystem has a carrying capacity of 1,000 deer. If the current population is 800, what percentage of the carrying capacity is currently being utilized?
Solution:
Percentage utilized = (800 / 1000) * 100 = 80%.
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Q9. If a tree absorbs 50 liters of water per day, how much water will it absorb in a month (30 days)?
Solution:
Water absorbed in a month = 50 liters/day * 30 days = 1,500 liters.
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Q10. A lake has a volume of 1,200,000 cubic meters. If the evaporation rate is 5% per month, how much water evaporates in one month?
Solution:
Water evaporated = 5% of 1,200,000 m³ = 0.05 * 1,200,000 = 60,000 m³.
