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Number Puzzles Questions and Answers

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7. What number should replace the question mark?
Ans: 4.
Sol.
6x9 = 54(reading down the middle two blocks).
 
8. What number should replace the question mark?
Ans: 12.
Sol.
Add the digits of each three figure number to obtain the two digit numbers.
 
9. Which number is the odd one out?
84129, 32418, 47632, 36119, 67626, 72927
Ans: 47632.
Sol.
All the others are three digit numbers followed by their square root, eg 361 followed by its square root, 19.