6.  


7
9
11
15


Answer

 Option

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

 Option

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

 Option

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

 Option

Working in columns, the sum of the numbers in each column is always 14.

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10.  


4
5
6
7


Answer

 Option

The numbers in each row and column add up to 15.

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