The pattern is (a) number times 2 plus 2 from which we get that figure’s number of shaded squares. Then, to find the number of unshaded squares, we add the figure number and the number of shaded squares.
In b), there are two numbers for (a): 11 and 14. With the pattern, we know the number of unshaded squares for both figures, which are 35 & 44 respectively. After that, we subtract 35 from 44 and get 9 which is the answer for b).
In c), we know the difference between the shaded and unshaded squares is 20, which will be the figure number. Using the pattern yet again, we find the number of shaded squares and unshaded squares which are 42 & 62 respectively, and with that, we can add both to get 104 which is the answer for c).