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Let initial contaminant = 100%.
After 1 stage: 100 × (1 - 0.4) = 60%
After 2 stages: 60 × 0.6 = 36%
After 3 stages: 36 × 0.6 = 21.6%
After 4 stages: 21.6 × 0.6 = 12.96%
After 5 stages: 12.96 × 0.6 = 7.776% < 10%
A retired engineer volunteers to measure the circumference of a circular exhibit with a diameter of 14 meters. Using π ≈ 22/7, what is the approximate circumference?
Circumference = π × diameter = (22/7) × 14 = 44 meters
A medical application uses a drug delivery system where each nanoparticle carries 3.2 × 10⁻⁹ grams of medicine. How many nanoparticles are needed to deliver 0.48 milligrams?
Convert 0.48 mg to grams: 0.48 × 10⁻³ = 4.8 × 10⁻⁴ g