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

Look at this series: U32, V29, __, X23, Y20, ... What number should fi

1.	Look at this series: U32, V29, __, X23, Y20, ... What number should fill the blank?
Answer» In this series, the letters progress by 1; the numbers decrease by 3.