1 / one and a half / one and a third / one and a quarter / one and a nineteenth I really can't. I have to go to class later!

1 / one and a half / one and a third / one and a quarter / one and a nineteenth I really can't. I have to go to class later!

The original formula is 1 / 3 / 4 / 4 / 5 / 6 / 7 / 8 / 9 / 10
=1 * 2 / 3 * 3 / 4 * 4 / 5 * 5 / 6 * 6 / 7 * 7 / 8 * 8 / 9 * 9 / 10
=1 * two tenths
=One in five