please see this link question 20
http://www.naec.ge/images/doc/documents/GRE-2010-MAT.pdf
problem is following on figure 1 as you see there is parallelipiped which has dimensions a,b,c and level of water h1 after turning this figure new dimensions and face is given.from the existing choices we should choose two of them to find what is h2(how much it is) i need help how to understand such problem when i will be given in future please help