The total water usage for a city is 450,000 gallons each day. Of that total, 21% is for personal use and 36% is for industrial use. How much more water is used for personal use than for industrial purposes?

67,500 gallons


36% of the water usage is for industrial use and 21% is for personal use. So, 36% - 21% = 15% more water is used for industry. 15% of 450,000 gallons is \(450,000 \times \frac{{15}}{{100}} = 67,500 \text { gallons }\)

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