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If a river's pollution level decreases from 80 ppm to 20 ppm over 4 years, what

Practice Questions

Q1
If a river's pollution level decreases from 80 ppm to 20 ppm over 4 years, what is the average annual decrease in pollution level?
  1. 15 ppm
  2. 20 ppm
  3. 10 ppm
  4. 5 ppm

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If a river's pollution level decreases from 80 ppm to 20 ppm over 4 years, what is the average annual decrease in pollution level?
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