21.

4
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7

```Answer

Answer: Option  D Explanation: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

Answer: Option  C Explanation: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

Answer: Option  C Explanation: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

Answer: Option  B Explanation: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
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7

```Answer

Answer: Option  C Explanation: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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