The water used in the cooling tower of a power plant can contain between 15% and 20% impurities. The water recycled through the plant contains 58% impurities, so it has to be mixed with clean water (containing 3% impurities).
Which inequality limits the amount of recycled water (x) in gallons in 1,000 gallons of cooling water?
• 0.15 × 1,000 0.58x + 0.03x 0.20 × 1,000
• 0.15 × 1,000 0.58x + 0.03(1,000 – x) 0.20 × 1,000
• 0.15 × 1,000 0.58x + 0.97(1,000 – x) 0.20 × 1,000
• 0.15 0.58x + 0.03x 0.20

Question

The water used in the cooling tower of a power plant can contain between 15% and 20% impurities. The water recycled through the plant contains 58% impurities, so it has to be mixed with clean water (containing 3% impurities).
Which inequality limits the amount of recycled water (x) in gallons in 1,000 gallons of cooling water?
•	0.15 × 1,000  0.58x + 0.03x  0.20 × 1,000
•	0.15 × 1,000  0.58x + 0.03(1,000 – x)  0.20 × 1,000
•	0.15 × 1,000  0.58x + 0.97(1,000 – x)  0.20 × 1,000
•	0.15  0.58x + 0.03x  0.20