The tank's capacity is 7200 liters based on the provided conditions.
The capacity of the tank is 7200 liters. Let's denote the original capacity as x. According to the given information, after removing one-third (x/3) and then half of the remaining amount (x/3)/2, 1200 liters are left. Setting up the equation: x - x/3 - (x/3)/2 = 1200, solving gives x = 7200.
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