Number Series - Verbal and Reasoning

Directions to SolveLook carefully for the pattern, and then choose which pair of numbers comes next.
Q1:

Look at this series: U32, V29, __, X23, Y20, ... What number should fill the blank?

A W26

B W17

C Z17

D Z26

ANS:A - W26

In this series, the letters progress by 1; the numbers decrease by 3.