Given that the dyalisis tubing is only permeable to water (and not to sucrose) the diffusion process (named osmosis when there is a selective permeable barrier) will drive molecules of water from the solution that has more water (the 10% sucrose solution) to the solution that has less water (the 30% sucrose solution) until the equilibrium is reached.
So, the 10% solution of sucrose (which initially is more concentrated in water) will end with less water, this is it will end more concentrated in sucrose, while the 30% sucrose solution will end with more water and a smaller concentraton on sucrose. The diffussion process will end when both solutions have the same concentration.