It depends on what currency - and therefore the choice of coins. In the UK, for example, there is a 20 p coin but no 25 p whereas in the US there is no 20 c but there is a 25 c coin.
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If you are Canadian (no joke), there are 618(101559956668416) ways. If you are american, there are 518(3814697265652) ways. Hope this helps!
18 nickels and 1 dime 18x5=90 and 90+10=100=$1.00
10 pennies and 8 nickels =18 coins 10 cents + 40 cents = 50 cents
There are 18 ways to make 30 cents with any combination of pennies, nickels, dimes and quarters. Where p=pennies, n=nickels, d=dimes, q=quarters: 30p 6n 3d 5p + 5n 5p + 1q 10p + 4n 15p + 3n 20p + 2n 25p + 1n 10p + 2d 20p + 1d 5p + 1n + 2d 5p + 3n + 1d 10p + 2n + 1d 15p + 1n +1d 1n + 1q 2n + 2d 4n + 1d
One solution is 16 nickels and 2 dimes.