36. 4
5
6
7

```Answer

Answer: Option  B Explanation:In each H shape, the central number is equal to the difference between the sum of
the 3 left hand numbers and the sum of the 3 right hand numbers. ```

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37. 4
5
6
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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38. 18
20
22
24

```Answer

Answer: Option  C Explanation:Add together values in corresponding positions of the top two crosses, and put the results in
the lower left cross. Calculate the difference between values in corresponding positions of
the top two crosses, and put the results in the lower right cross. Finally, add together the
values in corresponding positions of the lower two crosses to give the values in the central cross. ```

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39. 1
2
3
4

```Answer

Answer: Option  B Explanation:Start with the top left hand box, and move around the others in a clockwise spiral towards
the centre. Read each box as a pair of 2 digit numbers, one above the other. The sum of the
2 digit numbers in each box follows the sequence 55, 60, 65, 70 and 75. ```

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40. 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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