A luxury liner, Queen Marry II, is transporting several cats as well as the crew (sailors, a cook, and one-legged captain) to a nearby port. Altogether, these passengers have 16 heads and 45 legs. How many cats does the ship host?
Choose one
A) 3
B) 6
C) 9
D) 8
E) 7
a's +co +ca +cats = 16. sa's + 1 +1 +cats =16 or sa's +cats =14.   sa's(2) +2 +1 +cats*4 =45 sa's*2 +cats*4 = 42 or sa's +cats*2 =21 or 14-cats +cat*2 =21   then cats =7   7
<result>E</result>
A luxury liner, Queen Marry II, is transporting several cats as well as the crew (sailors, a cook, and one-legged captain) to a nearby port. Altogether, these passengers have 16 heads and 45 legs. How many cats does the ship host?