This sentence has V vowels plus C consonants
for a tally of L letters.

Replace the V, C and L with written out numbers,
such that when the sentence is complete with
these written out numbers, it will contain
exactly V vowels, C consonants and L letters.

Note: treat y as a consonant.
2 solutions, here's one: V=26, C=57, L=83

What's the other one?

This sentence has twenty-seven vowels plus fifty-seven consonants
for a tally of eighty-four letters.

Yes. Thank you.