In the following question, which one set of letters and numbers, when sequentially placed in the blanks of the given letter-number series, will complete it logically?
u _ v _ w 35 x 40 y 45 z 50

Given: u _ v _ w 35 x 40 y 45 z 50

Logic: Letters are incresing + 1 and numbers are increaisng + 5 place.

For, letter

u + 1 = v, v + 1 = w, w + 1 = x, x + 1 = y, y + 1 = z

For, number

25 + 5 = 30, 30 + 5 = 35, 35 + 5 = 40, 40 + 5 = 45, 45 + 5 = 50

So, the missing term are 25, 30

Thus, correct option is (c).