Hypertonic or hypertonic(Biology question)?

Posted on 2016-03-03 18:41:00 in Biology by RIAN

Hello! I'm studying for a bio exam and I have no idea how to solve this problem 
The question reads: 

(the diagram that shows this is attached) 
The solutions in the arms of a U-tube are separated at the bottom of the tube by a selectively permeable membrane. The membrane is permeable to sodium chloride but not to glucose. Side A is filled with a solution of 0.4 M glucose and 0.5 M sodium chloride (NaCl), and side B is filled with a solution containing 0.8 M glucose and 0.4 M sodium chloride. Initially, the volume in both arms is the same. Refer to the figure to answer the following questions. 

-How do I know which side is hypertonic/hypertonic related to the other side? 

thank you so much in advance!

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