At the beginning, there were 48L water in the two tanks, and the water in the last two tanks was equal, so there were 24L water in each tank.

Then push it back, and pour water from cylinder B to cylinder A for the second time, so that the water in cylinder A doubles, and the water in cylinder A is 24L after doubling, so it is 12L before the second pouring, and 48L and 48- 12=36L before the second pouring.

When pouring water from cylinder A to cylinder B for the first time, the water in cylinder B increased by 1 times, and the water in cylinder B increased by 1 times, reaching 36L, so it was naturally half of 18L before the first pouring, and the water in cylinder A was also 18L, so it was 65438 before the first pouring.

The result is 30L for cylinder A and 18L for cylinder B..