Puzzles - Logical puzzles

25.
Answer
:
B Grid
Explanation
:
Working in rows, left to right, top row then bottom, one black circle is added each time, with the positions of the circles moving (1/4) turn clockwise each time.

26.
Answer
:
6
Explanation
:
In each row of the diagram, the numerical value of the middle letter equals the sum of the left and right hand numbers, subtracting 3.

27.
Answer
:
A
Explanation
:
In each diagram, there are 2 lines of black dots, joining two sides together. The sides joined by the dots moves 1/4 turn clockwise as you move from left to right.