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Question:

The total water usage for a city is 35,000 gallons each day. Of that total, 31% is for personal use and 49% is for industrial use. How many more gallons of water each day is consumed for industrial use over personal use?

A 6,300
explanation

49% of the water consumption is industrial use and 31% is personal use so (49% - 31%) = 18% more water is used for industrial purposes. 35,000 gallons are consumed daily so industry consumes 18/100 x 35,000 gallons = 6,300 gallons.