You need to give the denomination and date of the coin. Also where you see the 77 at on the coin.
The Morgan dollar is 90% silver, or contains about .77 troy ounce of pure silver.
If by "go into" you mean divide, yes. 77 divided by 7 equals 11
LXXVII = 77
Presumably you mean 77%? You got 61 right.
78.4
Silver soldered was a fancy name for silverplate. 77 is likley a pattern or design number...
I assume you mean Canadian Centennial. If so, you would have to take the coin to a dealer or appraiser. Several different varieties of this coin were struck with values ranging from a few times face, up to over $700 . The only way to be sure is to have it examined in person.
There is around .77 ounces in a 1921 US silver dollar.
Mean = average; so (77+10)/2 = 43.5 = mean of 77 plus 10.
The Morgan dollar is 90% silver, or contains about .77 troy ounce of pure silver.
77 trillion dollars
-77 just as 77 is further from 0 on the positive side
In all music 'Op' or Opus mean 'work' so Op 77 would mean work number 77.
The country which on the silver medal in men's 77 kg weightlifting at the Rio 2016 Olympics was China.
As opposed to fake silver? It depends ... If your coin has no mint mark or a D next to the bow in Washington's wig, it's a standard Bicentennial quarter made from copper-nickel. If it has an S mint mark, it should be a proof coin in its original holder. These were made from 40% silver. Please see the Related Question for more.
In all music 'Op' or Opus mean 'work' so Op 77 would mean work number 77.
I think you mean 77/100. That would be .77 in decimals.