51.
Statements : All the books are papers. Some papers are journals. Some journals are calendars.

Conclusions :
I. Some journals are books.
II. Some calendars are papers.
III. Some books are journals.
IV. Some books are calendars.

52.
Statements : All the bottles are boxes. All the boxes are bags. Some bags are trays.

Conclusions :
I. Some bottles are trays.
II. Some trays are boxes.
III. All the bottles are bags.
IV. Some trays are bags.

53.
Statements : Some cars are jeeps. All the boxes are jeeps. All the pens are cars.

Conclusions :
I. Some cars are boxes.
II. No pen is jeep.
III. Some boxes are cars.