36.  


4
5
6
7


Answer

 Option

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

 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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38.  


18
20
22
24


Answer

 Option

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

 Option

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

 Option

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

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