One eighth
1/4
1/30th
More
18,24,30,36.
One eighth
There are infinitely many fractions between one sixth and three fifths.
1/4
One whole step.
Six thirty-fifths. One fifth is 7/35, one seventh is 5/35, so half way between is 6/35.
1/6
1/30th
More
66/155
23/30
There hasn't been a fourth or fifth yet. The fourth one is in production. A sixth one is unlikely.
18,24,30,36.