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Answer:
1800litres
Step-by-step explanation:
Let the total litres in the tank be x
If the tank is two - thirds full of water, then the total litres initially will be 2x/3 litres
When 300 litres is used, then the remaining will be 2x/3 - 300
Equating this to half of the tank i.e x/2, we will have:
2x/3 - 300 = x/2
Collect like terms
2x/3 - x/2 = 300
Multiply through by 6
4x - 3x = 300(6)
4x-3x = 1800
x = 1800
This means that the tank can hold 1800litres of water