Answer: there is now more water in the juice in glass B because the mixture in glass B now contains water from glass A.
Explanation:
Glass A: It contains 100 ml of liquid, which is pure water.
Glass B: It contains 100 ml of liquid, which is a mixture of 90 ml of juice and 10 ml of the mixture from glass A, which contains water and juice.
So, in the final state:
There is only water in glass A.
There is both juice and water in glass B.