Answer: For 5 pirate ships, you need 55 pirates. For 11 pirate ships, you need 121 pirates.
Explanation:
22 (# of pirates) divided by 2 (# of ships) = 11 pirates per ship. Use this knowledge of 11 pirates per ship to find how many pirates you need for different numbers of ships:
11*5= 55 for 5 ships &
11*11= 121 pirates for 11 ships.