Number Series Puzzles Questions

17. What number should replace the question mark?
  What is the next number?
Answer
Ans = 1.
The number formed at the top is half of the number formed at the bottom i.e. 358 x 2 = 716.
18. Which two numbers should replace the question mark?
  What is the next number?
Answer
Ans = 24.
24336 x 2 = 48672, ie the number formed at the top half of the decagon is double the number formed by the bottom half.
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