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U.S. nickels weigh 5 grams each and contain 25% nickel with 75% copper.
Are you serious? You can't figure that out? I hope you're either under 6 years old or an American and your lack of rudimentary maths skills can't spread beyond your borders or coastline.
just do the math 700 - 227 use a calculator
A UK £2 coin weighs 12 grams so 80 of them will weigh 960 grams.
The U.S. has never made a gold half dollar coin. Look at the coin again and post new question.