11.

4
5
6
7

```Answer

Answer: Option  D Explanation:Starting with the numbers in the top row, and following straight lines through the centre of the diagram,
subtract the middle number from the top number to give the corresponding value on the bottom row. ```

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12.

4
6
8
10

```Answer

Answer: Option  D Explanation: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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13.

4
5
6
7

```Answer

Answer: Option  C Explanation:Numbers in the lower left circle equal the sum of the numbers in corresponding segments of
the top two circles, and numbers in the lower right circle equal the difference of the
numbers in corresponding segments of the top two circles. ```

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14.

4
5
6
7

```Answer

Answer: Option  A Explanation:In each triangle, the central number equals the sum of the three outer numbers divided by two. ```

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15.

4
5
6
7

```Answer

Answer: Option  B Explanation: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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