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This question is impossible to answer. It is not possible to know how many quarters you started with when all you know is how many you have now.
Yes
All pre-1965 US quarters and dimes are 90% silver.
All quarters dated 1965 and later are made of a "sandwich" of copper and nickel.
None in circulating quarters. Except for special proof sets and some uncirculated bicentennial sets, all quarters minted after 1964 are made of copper and nickel.