A $1 bill weighs about 1 gram and there are about 454 gm in a pound.
Also, this site has a Coins and Currency thread that is more appropriate to questions about, uh, coins and currency. Money and Credit is generally for questions about credit cards, finances, checking accounts, etc.
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Five 20 dollar bills makes 100 dollars.
You would need the mass of a dollar bill in the currency you are interested in. Your question is ambiguous, and could be about bills each worth $100 or about hundreds of bills each worth $1. Even "pound" could refer to mass, weight, or English currency.
You need 3500 $100 bills.
To find out how many $20 bills make $200,000, divide $200,000 by $20. This calculation gives you 10,000. Therefore, you would need 10,000 twenty-dollar bills to make $200,000.
20