11
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         ?
       1   3
     3   3   9
   9   3   1   9

Find the missing number in the pyramid?

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13
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Answer:

3

Solution:

Divide the larger of the two numbers in the cells below by the smaller of the 2 numbers.


 Original Pyramid  |     Calculations 
                   |
         ?         |         3/1
       1   3       |      3/3   9/3
     3   3   9     |   9/3   3/1   9/1
   9   3   1   9   |  9    3     1     9 

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1
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The answer is 1/3

because(3/9)/(1/3)=1

and 1/(1/3)=3

3/(1/3)=9

With the same calculations we can obtain the rest of the numbers 1, 3, 9 in the pyramid.

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