Mexican currency is denominated in pesos rather than dollars, but they use the $ sign to indicate pesos, so it causes a lot of confusion.
You'll need to post a new question with your coin's date and a description of the image on it. The date is very important because Mexico changed the value of its currency in 1992-93. "Nuevo pesos" (new pesos) were issued to replace old ones at a 1-to-1000 exchange rate. That means if you have a coin worth 20 nuevo pesos, it would exchange for about two U.S. dollars. However, if it's old pesos, it would be worth only one-one thousandth as much - i.e. just two-tenths of a cent.
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5*20 cents (Australian) make a dollar. In US and Canadian coins, a 50 cent piece, a quarter, two dimes, and a nickel also make a dollar.
There are 20 nickels in a dollar, so one nickel is 1/20 of a dollar.
I have a 20 dollar gold piece, st. gaudens, it has a (C) with an (A) in the middle under the date, nothing on top of the date.......
One half dollar (50 cent piece) and two quarter dollars (25 cent each piece)
20 nickels is a dollar.