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U.S. dimes, quarters, half dollars, and dollars dated before 1965 contain 90% silver with 10% copper.
There are 40 quarters in 10 dollars. This can be calculated by dividing 10 dollars by 0.25 dollars (which is the equivalent of 25 cents) to get 40. Therefore, there are 40 quarters, or 25 cent coins, in 10 dollars.
Forty quarters equal ten dollars.
To make $2.50 using quarters, you would need 10 quarters. This is because each quarter is worth $0.25, so 10 quarters x $0.25 = $2.50. This calculation is based on the fact that there are 4 quarters in a dollar.
There are forty twenty-five cent pieces in ten dollars(US).