Numbers Puzzles

39. Which number is the odd one out?
159
248
963
357
951
852
Answer
248
In the rest there is the same difference between each digit, eg: 8 (–3) 5 (–3) 2.
40. What number continues the sequence?
25, 50, 27, 46, 31, 38, 39, ?
Answer
22
There are two alternate sequences, the first increases by 2, 4, 8 etc and the second decreases by 4, 8, 16 etc.
41. If a car had increased its average speed for a 210 mile journey by 5 mph, the journey would have been completed in one hour less. What was the original speed of the car for the journey?
Answer
30 mph.
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