Answer:
48
Explanation:
assume holds x litres
1/2 x + 12 = 3/4 x
so 1/4 x =12
x =48
48 liters.
Going from 3/4ths full to 1/2 full has a difference of 1/4; that makes 12 liters 1/4 of the tank.
12 times 4 is 48.
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