$2 for the nickels (40 nickels)
$.50 for the pennies ( 50 pennies)
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Since a roll of nickels is $2, you divide 2 by .05, which = 40, so there are 40 nickels to a roll.
Oh, dude, you're really asking me about the length of rolls of coins? Well, a roll of quarters is 40 coins long, so it's like, longer than the other rolls because quarters are bigger. A roll of dimes, nickels, and pennies is 50 coins each, so they're all like, the same length. But seriously, who measures coins in lengths? Just go buy some snacks with those coins and chill out.
40 nickels are in a roll of $ 2
If you had 40000 US pennies, it would mean you have the equivalent $400 US dollars. This can be solved by taking 40000 and multiplying it by .01 A more interesting question is how much would all those pennies weigh? To fill a roll of pennies takes 50 coins, and a roll of pennies equals 50 cents. Each roll of pennies weighs roughly .31 pounds. Therefore 40000 pennies would weigh roughly 248 pounds, that is a lot of weight to carry around in coinage when it could all be replaced by four $100 bills and fit easily in your pocket.
Oh, dude, let me break out my calculator for this mind-blowing math problem. So, if you start with one penny and double it every day for 365 days, you'd end up with... drum roll, please... $1.84 quadrillion! Like, who needs a lottery when you've got compound interest, am I right?