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Number Puzzles Questions and Answers

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34. What goes into the empty square?
Ans: 16.
Sol.
Each number in the bottom rows is the sum of the number above it and the previous number.
 
35. What number should replace the question mark?
Ans: 7.
Sol.
The numbers in each line contain the digits 1 – 9 once each only.
 
36. What is X?
Ans: 1
Sol.
Spaced correctly, the series becomes 13 15 17 19 2(1)