Puzzles Questions

13. Which number replaces the question mark?
  What is the next number?
Answer
Ans=10.
In each square, take the sum of the odd numbers and subtract the sum of even numbers to give the number enclosed in the central square.
14. Which letter should be added to the empty segment?
  What is the next number?
Answer
Ans = Y.
Going clockwise, the letters in alternate segments advance 6.
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