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One 1964 or earlier silver quarter= 0.1808 of an ounce of silver. So, it takes about 6 90% silver quarters to make one ounce of silver. 6 silver quarters= 1.0851 ounces.
For modern U.S. quarters like you find in change, none. They don't contain any silver - they're made of copper and nickel. For quarters dated 1964 and earlier, each one contains 5.625 gm of pure silver, almost exactly 1/5 of an ounce. So 5 old quarters contain a total of 1 oz of silver.
The Philadelphia mint released 564,341,347 in circulation. The Denver mint released 704,135,528.
Current clad quarters (1965 and later) weigh 5.67 grams. Silver quarters, minted from the mid-1870s until 1964, weighed 6.25 grams.
A quarter weighs 5.67 grams. So five clad quarters would equal one standard ounce.