Dime = 2.268 grams
Nickel = 5 grams
Penny = 2.5 grams
(3 x 2.268) + (2 x 5) + (1 x 2.5) = 19.304 grams
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You could have: 8 nickels and 1 penny or 6 nickels and 11 pennies or 4 nickels and 21 pennies or 2 nickels and 31 pennies. The option of 0 nickels and 41 pennies is excluded by the necessity that the amount is made up of dimes, nickels and pennies; 0 nickels would mean the $1.21 was made up of dimes and pennies only.
You would have to know the exact number of coins per denomination. Modern U.S. quarters weigh 5.67 grams. Dimes 2.27 grams. Nickels 5 grams.
One modern U.S. dime weighs 2.268 grams, and one U.S. nickel weighs 5 grams. Six nickels weigh 30 grams, which would equal 13.23 dimes.
Two nickels equal the value of one dime, therefore fourteen (14) nickels would equal the value of seven (7) dimes.
well if a dimes 10 and a nickels 5 the answer would be 9.. UK here pence and pounds