Brain Teasers
Triple Layer
Series
Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.Series
What number comes next?
27 39 54 73 97 ...
27 39 54 73 97 ...
Hint
Double embeddedAnswer
127There are two series embedded in the first set of numbers: (Set A is the original series)
Set A: 27 39 54 73 97
First find the difference between each group of numbers...
39 - 27 = 12
54 - 39 = 15
73 - 54 = 19
97 - 73 = 24
This gives us a new set of numbers...
Set B: 12 15 19 24
Still no Pattern? Do the same thing again with set B.
15 - 12 = 3
19 - 15 = 4
24 - 19 = 5
Set C: 3 4 5
Now we see a pattern in set C.
Solution:
This equation gives us the next number in the series for Set B: x - 24 = 6 (x = 30)
which in turn gives us the next number in the series for Set A: y - 97 = 30 (y = 127)
This type of series problem is often found in I.Q. tests.
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