Denny asked: Premise: "A young man in jeans and tennis shoes lies down on an upholstered bench with a backpack still strapped to his back."
Hypothesis: "A guy lies down with his backpack still attached."
Do we know that the hypothesis entailed by the premise?.
Le: OK, so how can I answer with some explanation?
A young man can be called a guy. Having a backpack strapped to a back means having a backpack attached to a back.
The answer: yes.