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Number Puzzles Questions and Answers

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64. What number should replace the question mark?
Ans: 9.
Sol.
Looking across, lines containing 1 number total 7, lines of 2 numbers total 14, lines of 3 numbers total 21 and lines of 4 numbers total 28.
 
65. What number should replace the question mark?
Ans: 3
Sol.
looking from the first array to the second array, all odd numbers increase by 1 and even numbers decrease by 1.
 
66. What is the difference between the lowest number and the average of all the numbers?
Ans: 13
Sol.
13.