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Answer:
5390 gallons of water was wasted by the city's residents last year.
Step-by-step explanation:
Let denotes gallons of water wasted by the city's residents last year.
Gallons of water wasted by the city's residents this year = 2695 gallons
This is 50% less than last year.
Therefore,
gallons
So, 5390 gallons of water was wasted by the city's residents last year.