Premise: "Motorcycles parked at a grill restaurant."\nHypothesis: "Hells angel' motorcycles parked at a restaurant for their gathering."\nDo we know that the hypothesis entailed by the premise?
Let's think step by step.
it is not possible to tell
Not all motorcycles belong to the Hell's Angel'.

And the motorcycles do not need to be there for a Hells Angels Gathering.

Their motorcycles could be there because a few of them wanted to get dinner or something.

.

The final answer: it is not possible to tell