11.  


311
253
312
254


Answer

 Option

Starting at the top left, and moving through the diagram in a Z shape, double each number and add 3 to give the next number along.

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12.  


9
12
6
8


Answer

 Option

The number at the centre of each triangle equals the sum of the lower two numbers minus the top number.

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13.  


29
36
45
51


Answer

 Option

Moving to the right, double each number and subtract 3 to give the next number along.

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14.  


2
3
4
5


Answer

 Option

Starting with the 10 at the top, one set of numbers increases by 3 each time, written in alternate boxes as you move down the diagram, and the other set of numbers decreases by 2, written in the boxes remaining.

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15.  


2
4
6
8


Answer

 Option

On each row, add the values of the left hand and central boxes to give the value in the right hand box.

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