21.  


2
3
4
5


Answer

 Option

Starting with the 10 at the top, one set of numbers increases by 3 each time, written in alternate boxes as you move down the diagram, and the other set of numbers decreases by 2, written in the boxes remaining.

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22.  


2
4
6
8


Answer

 Option

On each row, add the values of the left hand and central boxes to give the value in the right hand box.

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23.  


4
6
8
10


Answer

 Option

In each star diagram, the number in the centre equals the sum of the top three numbers, subtracting the sum of the bottom two numbers.

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24.  


21
23
25
27


Answer

 Option

Starting top left, and moving down in columns from left to right, the numbers follow the sequence of prime numbers from 2 to 23.

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25.  


10
12
14
16


Answer

 Option

Numbers in the segments of the left hand circle equal the difference between numbers in corresponding segments of the two right hand circles.

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