Puzzles - Number puzzles

Answer : 6
Explanation : In each diagram, the central value equals the difference between the sums of the numbers in the left hand column and the sums of the numbers in the right hand column.

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Answer : 14
Explanation : In each diagram, the number at the top equals the average of the four smaller numbers.

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Answer : 11
Explanation : In each triangular group of circles, start with the longest row and add together 3 adjacent values and put this sum in the circle directly above or below the centre of the 3 values. Continue this sequence towards the apex of each triangle.

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