The ratio of spinsters to cats is 2 to 7. If there are 55 more cats than spinsters, how many spinsters are there?  Select the correct option.
A) 20 B) 21 C) 22 D) 23 E) 24

Rationale: "let 2 x be the number of spinsters . then 7 x is the number of cats . 7 x - 2 x = 55 x = 11 and the number of spinsters is 2 ( 11 ) = 22 . the answer is c ."
Answer: C