Mathematics, 07.12.2021 23:30, jociymartinez6214

There are some 1-dollar bills, some 5-dollar bills, and a 20-dollar bill in an envelope. The number of 1- dollar bills is three times the number of the 5-dollar bills. We randomly pull a bill from the envelope. How
many 1-dollar bills are in this envelope if the expected value of the bill pulled is $2.72?
The number of 1-dollar bills is

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There are some 1-dollar bills, some 5-dollar bills, and a 20-dollar bill in an envelope. The number...