Copper
(dimes X 10) + (nickels X 5) = 145 and dimes - nickels = 4 14 dimes + 1 nickel =145 13 dimes + 3 nickel =145 12 dimes + 5 nickel =145 11 dimes + 7 nickel =145 10 dimes + 9 nickel =145 since 11-7 = 4 11 dimes + 7 nickels =145
Dimes minted before 1965 are made of 90% silver and 10% copper. Dimes minted after 1965 are made of a copper core with a outer layer of nickel.
Modern copper-nickel dimes weigh 2.27 gm. Older (1964 and earlier) 90% silver dimes weighed 2.5 gm.
Present day nickel, dimes and quarters are composed of copper and nickel.
6 dimes and one nickel make 65 cents, which is $0.65,0.65
Two quarters and another coin is a nickel. Only one of them has to not be a nickel, so that would be the quarter.
Four dimes one nickel two pennies are worth 47 cents
6 dimes, 6 pennies; or 6 dimes, 1 nickel, and a penny.
15 nickels 16 dimes
6 dimes = 60 cents and 1 nickel = 5 cents; so 5/60 = 0.08333...., or 8.33%
The combinations depend on how many are dimes and how many nickels.
Starting in 1965 US dimes are made of a Copper-Nickel alloy (.750 copper & .250 nickel) bonded to a core of pure copper.