Logic Puzzles Questions and Answers

55. What number should replace the question mark?
  What is the next number?
Answer
Ans = 20.
Add 1,1,2,2,3,3,4,4
56. What number should replace the question mark?
  What is the next number?
Answer
Ans = 1611.
9 + 7 = 16 and 4 + 7 =11.