Number Series Puzzles Questions

1. What number should replace the question mark?
 
Answer
Ans = 4.
(6 +7) – (4+5)
2. What number should replace the question mark?
  What is the next number?
Answer
Ans = 8.
The number in the middle is the average of the numbers round the outside. So, 7+8+9+7+8+9 = 48, and 48/6 = 8.
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