If someone is one and twenty, they are one and twenty years old, or one plus twenty years old, or 1 + 20 or 21 years old. Another similar wording is "four and twenty black birds" from Sing a Song of Sixpence, the well known English nursery rhyme. In those couple of lines of verse, four and twenty Blackbirds is four plus twenty blackbirds or 4 + 20 or 24 blackbirds.
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20% 4 divided by 20 = 0.20 0.20 is 20% Four is one fifth of twenty. One fifth in a percent is twenty percent (20%), because percent means out of 100, and 100 divided by five equals twenty. If you would like to know why percent is called percent, it is actually very simple. PER - meaning out of, and CENT meaning 100. Out of 100.
121 is one twenty-one
Twenty one twenty fifths can be written as a fraction as 21/25.
Negative twenty nine minus negative twenty one is negative eight.
If you have twenty-seven things lined up in a row, then the last one is the twenty-seventh one.