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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.
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20 times 5 cents = $1
$4. A nickel is 5 cents, so $1 is 100 cents / 5 cents = 20 coins. Finally, 80/20 = 4.
The answer will depend on what cents: US cents, Euro cents or other countries' cents. Different countries use different coinage: the US has a 25 cents coin but but not 20 cents whereas the Euro has a 20 cent coin and not 25.