2004A is the series of bill. The year is updated when either the bill's design is changed or there's a new Treasury Secretary. When there's a letter following the date, that means that there is a new U.S. Treasurer.
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With an exchange rate of 1 Canadian Dollar to 20 Japanese Yen for every 1 Canadian Dollar you will get 20 Japanese Yen. So, for example, if you exchanged 40 Canadian Dollars, you would get 40×20 = 800 Japanese Yen.
There are 20 nickels in a dollar, so one nickel is 1/20 of a dollar.
A nickel is worth 5 cents. If by "20" you mean 20 cents, you need 20 / 5 = 4 nickels. If you mean 20 dollars, a dollar is 100 cents so $20 = 2000 cents, and you'd need 2000 / 5 = 400 nickels.
20 nickels is a dollar.
You'd get 10, since 20 ten dollar bills would be 200 dollars. 200 divided by 20 is 10.