6.

7
9
11
15

```Answer

Answer: Option  C Explanation:Split the left and right hand circles in half, vertically. The sum of the numbers in the left hand
half of the left circle appears in the top left hand segment of the middle circle, and the
sum of the numbers in the right hand half of the left hand circle appears in the bottom left hand
segment of the middle circle. Repeat this pattern for the right hand circle. ```

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7.

5
7
9
11

```Answer

Answer: Option  B Explanation:In each diagram, the sum of the upper left and upper middle numbers is written in the centre box,
and the sum of the upper right and upper middle numbers is written in the lower central box. ```

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8.

4
5
6
7

```Answer

Answer: Option  C Explanation:Looking at the diagram in rows, the central circle equals half the sum of the numbers in the other circles to
the left and right of the centre. ```

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9.

4
5
6
7

```Answer

Answer: Option  A Explanation:Working in columns, the sum of the numbers in each column is always 14. ```

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10.

4
5
6
7

```Answer

Answer: Option  D Explanation:The numbers in each row and column add up to 15. ```

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