Answer:
12 liters
Explanation:
There's probably an equation for it, but it's not coming to me right now.
However, it's easy enough to brute-force it.
If half the 12,288 L is removed, how much is left?
6,144
And if half of that is removed, how much is left?
3,072
Half of that?
1,536
Keep going until you've halved it 10 times:
768
384
192
96
48
24
12
That's the 10th time that half the water remaining was taken out. So the answer is that 12 liters are left.
Which is essentially nothing of course, and might as well be zero. Because if the full tank was 12,288 L, what percentage of that is 12 L?
12/12,288 = 0.00097, which is only about 1/10th of 1%.
It's kind of a silly question, but that's a way to do it.