Final answer:
Richard Grenville traveled with at least three ships after being separated from his original fleet due to storms, including the Tiger, the Elizabeth, and a new boat constructed in Puerto Rico.
Step-by-step explanation:
The passage describes Sir Richard Grenville's journey, where he was separated from his fleet due to storms. Grenville, on the Tiger, eventually made his way to Puerto Rico and was joined by the Elizabeth. As no other ships joined them and with the addition of captured Spanish ships and a newly built boat, it can be understood that Richard Grenville traveled out of Puerto Rico with a minimum of three ships: the original Tiger and Elizabeth, and one new boat constructed while in Puerto Rico.