Hi willyhud,
PT 55 Section 3 Q 24 is indeed a very difficult question; it seems like you do understand it. I wouldn't necessarily consider it as having two assumptions, but you do have to connect two terms; the stimulus is set up in such a way to encourage that connection, but it is still challenging.
PT57 Section 2 Q24 is even more difficult:
read great poem
believe poem expresses contradictory ideas
meaning of poem
NOT whatever author intends to communicate
author writing great poem
NOT intend to communicate contradictory ideas
Answer choice E:
reader believes poem expresses idea
(part of) meaning of poem
This fills in the missing assumption and leads to:
read great poem
believe poem expresses contradictory ideas
contradictory idea (part of) meaning of poem
author writing great poem
NOT intend to communicate contradictory ideas
Therefore, meaning of poem
NOT whatever author intends to communicate
Does that make more sense?