Two dollars equal exactly forty nickels.
How did we arrive at this figure? by calculating the amount of cents in two dollars, then dividing that figure by the cents in a nickel.
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More specifically, there are 5 cents in a nickel and 200 cents in a $2.00.
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As a result, when we divide 200 by 5, the result is 40.
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In the same way, a standard roll of nickels includes 40 coins.
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This contains all varieties of nickels produced by the US Mint; however, only Jefferson Nickels from 1942 to 1945 have a silver alloy on the back, whilst all other varieties are made of a copper and nickel alloy of 75% and 25%, respectively