Suppose you have a container divided by a membrane that is permeable to water but not to sugar. side a has a 10% sugar solution. side b has a 40% sugar solution. both start out at 10 cm in height. over time, the height of one side drops to 7 cm and the height of the other side increases to 13 cm. which side of the container is now at 7 cm? explain

Side B will be higher. 
The idea is that water will move through the membrane to equalize the concentration of sugar on either side. Since side B has a higher concentration the water will diffuse through the membrane to dilute the concentration of sugar while also raising the overall water height.

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