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Number Puzzles Questions and Answers

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52. What number should replace the question mark?
Ans: 0.
Sol.
From the first array to the second array the four corner and the middle numbers increase by 1.
From the second array to the third array the remaining numbers decrease by 1.
 
53. What comes next in the series?
Ans: 16
Sol.
Each number reverses the previous number and adds 1 to each digit. Thus, in the first two terms, 16 reversed is 61, which then changes to 72. In the penultimate term, 50 reversed becomes 05, which in turn becomes 16 - by adding 1 to each digit.
 
54. What number should replace the question mark?
Ans: 6
Sol.
So that the numbers in the triangles squares and circles add upto 33.