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Number Puzzles Questions and Answers

61. What number should go into the blank space?
Ans: 59.
Sol.
Proceeding from top to bottom along the rows from left to right, add the two previous numbers and add 1, then add the two previous numbers and subtract 1, and so forth, adding 1 and subtracting 1 alternately. Thus the two numbers previous to the blank square are 22 and 38. These are added together, giving 60, and 1 subtracted from the total.
 
62. What number should replace the question mark to a definite rule?
Ans: 201
Sol.
Add digits to previous number.
 
63. What comes next in the series?
Ans: 99
Sol.
After the two terms each subsequent term is the sum of the two previous terms.