The maximum amount of water that can be used by each house on a daily basis is 100 liters.
Equation
- Common utilities in the community = 500 liters
- Number of houses = 40 houses
- Capacity of water tank = 4,500 liters
- Water used per house = x
4,500 = 500 + 40x
4,500 - 500 = 40x
4,000 = 40x
x = 4,000 / 40
x = 100 liters
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