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Number Puzzles Questions and Answers

58. Each letter points to a row of six numbers. Which is the odd one out?
Ans: D.
Sol.
D adds up to 36. The others add up to 33.
 
59. What is X?
Ans: 6
Sol.
The series is spaced incorrectly. When the spacing is correct it becomes : 2 4 8 16 32 64 128 which is an obvious doubling up series.
 
60. The average of three numbers is 29. The average of two of these numbers is 38. What is the third number?
Ans: 11
Sol.
3 numbers 29 × 3 = 87 total
2 numbers 38 × 2 = 76 total
The third number must therefore be 87 – 76 = 11.