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Number Puzzles Questions and Answers

13. What number should replace the question mark?
Ans: 1.
Sol.
Multiply the bottom two numbers then take the square root,
i.e. 1×4 = 4 and √4 = 2.
 
14. What number should replace the question mark?
Ans: 4.
Sol.
Looking across at the three circles, the number in the middle is the product of the two numbers in the same segment in the other two circles.
Thus, 3×2 = 6, 7×3 = 21 and 4×4 = 16.
 
15. What number should replace the question mark?
16, 23, 19, 19, 22, 15, 25, ?
Ans: 11.
Sol.
There are two alternate sequences + 3 and - 4.