Numbers Puzzles

19. Which number is missing from this wheel?
 
Answer
152
As you move clockwise multiple the previous number by 2 and ado 2, 3, 4, 5 and 6.
20. What is X?
 
Answer
6
The series is spaced incorrectly. When the spacing is correct it becomes: 2 4 8 16 32 64 128, 256, which is an obvious doubling-up series..
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