The Problems (Greek: Προβλήματα; Latin: Problemata) is a work attributed to Aristotle, possibly falsely, bringing together almost 900 problems in question and answer format.
Free online texts
Internet Archive: The Works of Aristotle, Vol. VII - The Problemata, translated by E.S. Forster, (1927). Multiple formats.
Loebulus. L317 - Aristotle -- Problems II: Books 22-38. PDF of public domain Loeb edition in Greek and English.
Wikipedia: Problems (Aristotle).
The Great Conversation: Further reading at Tom's Learning Notes
Ancient Greek resources: Learn to read Greek classics in the original.