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Bottom layer age = 2760 + 1500 = <<2760+1500=4260>>4,260 years
A microbiologist treats a culture with 50,000 bacteria. An antibiotic reduces the count by 40% each hour. How many bacteria remain after 3 hours?
An architect plans a multi-story building with 7 floors. Each floor has 18 windows, and each window uses 1.6 kg of framing material. If 85 kg is allocated for structural reinforcements, how much total material is used?
Total material = 201.6 + 85 = <<201.6+85=286.6>>286.6 kg
A geologist measures earthquake magnitudes over a week: 3.2, 3.6, 4.1, 3.8, and 4.3 on the Richter scale. If the destruction index is 10 times the magnitude, what is the average destruction index for the five days?
Sum of magnitudes = 3.2 + 3.6 + 4.1 + 3.8 + 4.3 = <<3.2+3.6+4.1+3.8+4.3=19>>19
Alice has a collection of 120 stamps. She donates 25% of her collection to a local museum and then buys 15 more stamps. How many stamps does Alice have now?
A train travels 150 miles at a speed of 50 miles per hour and then continues for another 200 miles at 80 miles per hour. What is the total travel time for the train?
A cylindrical tank with a radius of 3 meters and a height of 10 meters is filled with water. If water is drained at a rate of 2 cubic meters per minute, how long will it take to empty the tank?
A car travels 300 miles using 10 gallons of fuel. If fuel costs $3.50 per gallon, what is the cost per mile for the fuel used?
