21.  


4
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7


Answer

 Option

Reading each row of the diagram as a series of 3 digit numbers, the centre 3 digit number equals the sum of the top 2 numbers, and the sum of the lower 2 numbers.

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22.  


4
5
6
7


Answer

 Option

In each group of circles, the centre number equals the average of the four surrounding numbers.

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23.  


4
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7


Answer

 Option

The number at the centre of each segment equals the sum of the numbers on the outside of the opposite segment.

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24.  


4
5
6
7


Answer

 Option

The numbers in the lower circles equal the numbers in corresponding segments in the upper circles multiplied by two, then subtract 3 for the left hand circle, 4 for the middle and 5 for the right hand circle.

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25.  


4
5
6
7


Answer

 Option

In each circle, double the numbers on the left hand side and put the result in the opposite segment on the right hand side.

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