Procedural Thinking

I did the following steps, but I’m kinda stuck🥹

hey mate, I guess your confusion is based on “Glass D contains a fifth of THE TOTAL VOLUME of water”, here it is meant like one fifth of ABCDE combined [or 1/5*(E/4+3E/4+E+D+[D+E])=D, so it becomes D=E. However, I’m not so sure with the answer because from my solution both answers A and E must be correct…

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