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Number Puzzles Questions and Answers

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55. What number should replace the question mark?
Ans: 44.
Sol.
(7×5) + 9 = 44.
 
56. What is X?
Ans: 4
Sol.
The first term is followed by the last term; the second term is followed by the penultimate term, and the third term follows the same procedure. Thus the series becomes: 25 24 22 19 15 10 4(x) - ie: decreasing by one more each time: – 1 – 2 – 3 – 4 – 5 – 6(x)
 
57. What number should replace the question mark?
15, 30, 45, 90, 135, 270, ?
Ans: 405
Sol.
Multiply by 2 and 1.5 alternately.