Ratios & Percentageshard
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A water purification system has three filtration stages. Stage 1 removes 80% of contaminants, Stage 2 removes 75% of the remaining contaminants, and Stage 3 removes 60% of what remains. If water initially contains 8,000 ppm of contaminants, how many ppm remain after all three stages?
A water purification system has three filtration stages. Stage 1 removes 80% of contaminants, Stage 2 removes 75% of the remaining contaminants, and Stage 3 removes 60% of what remains. If water initially contains 8,000 ppm of contaminants, how many ppm remain after all three stages?