Puzzles Questions and Answers

17. Which number is missing?
  What is the next number?
Answer
Ans = 6
In each diagram, the central number equals the difference between the product of the two right hand numbers and the product of the two left hand numbers.
18. Which number logically finishes this puzzle?
  What is the next number?
Answer
Ans = 60.
Multiply the figures at the opposite ends of the central circle to give the same answer.
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