The Problems is an Aristotelian

Aristotle

Aristotle was a Greek philosopher and polymath, a student of Plato and teacher of Alexander the Great. His writings cover many subjects, including physics, metaphysics, poetry, theater, music, logic, rhetoric, linguistics, politics, government, ethics, biology, and zoology...

 or possibly pseudo-Aristotelian

Pseudo-Aristotle

Pseudo-Aristotle is a general cognomen for authors of philosophical or medical treatises who attributed their work to the Greek philosopher Aristotle, or whose work was later attributed to him by others....

 collection of problems written in a question and answer format as its authenticity has been under questioning. The collection, gradually assembled by the peripatetic school, reached its final form anywhere between the third century BC to the 6th century AD. The work is divided by topic into 38 sections, and the whole contains almost 900 problems.

Later writers of Problemata include Plutarch

Plutarch

Plutarch then named, on his becoming a Roman citizen, Lucius Mestrius Plutarchus , c. 46 – 120 AD, was a Greek historian, biographer, essayist, and Middle Platonist known primarily for his Parallel Lives and Moralia...

, Alexander of Aphrodisias

Alexander of Aphrodisias

Alexander of Aphrodisias was a Peripatetic philosopher and the most celebrated of the Ancient Greek commentators on the writings of Aristotle. He was a native of Aphrodisias in Caria, and lived and taught in Athens at the beginning of the 3rd century, where he held a position as head of the...

, and Cassius Iatrosophista.