21.  


4
5
6
7


Answer

 Option

In each triangle, the central number equals the sum of the three outer numbers divided by two.

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22.  


4
5
6
7


Answer

 Option

In each star, the central number equals the difference between the sum of the even numbers and the sum of the odd numbers from the points of the star.

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23.  


17
19
21
23


Answer

 Option

As you move diagonally down, numbers follow the sequence of Prime Numbers.

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24.  


4
5
6
7


Answer

 Option

In each triangle, the number at the apex of the triangle equals the average of the two numbers at the bottom.

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25.  


20
22
24
26


Answer

 Option

In each circle, the lower number equals the product of the top two numbers, subtracting 3 for the left hand circle, 4 for the middle, and 5 for the right hand circle.

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