In a silver 1976 washington quarter, what is the silver content expressed as a % of a troy ounce?

Question

I know its 40% of the '76 quarters coin weight .I need to know how much of a troy ounce of silver it contains.Example 1976 silver ike dollar equals .3616 troy ounce.

Answer 1

The silver was reduced to cladding in 1965 and totally eliminated in 1970.

Answer 2

There is no silver content in a 1976 quarter.  The mint stopped adding silver to quarters in 1963.

Answer 3

The answer is .0739 oz of pure silver according to A Guide Book of US Coins. (The Red Book).