8 quarters :]
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12 quarters. 20 dimes= 2 dollars, and 20 nickels= 1 dollar. 3 dollars, multiplied by 4 because of the quarters, is 12 quarters
pennies - 100 nickels - 20 dimes - 10 quarters - 4
10 dimes 5 quarters
11 ways. You need an even number of quarters and the rest dimes; so 0,2,4,6,8,10,12,14,16.18 or 20 quarters with the balance dimes in each case.
As the question is stated, the answer is none (or indeterminate). If you are asking how many quarters have the same value as 20 nickels and 20 dimes, then the answer is 12 (because you have 20*0.05+20*0.10=$3.00, and $3.00/$0.25=12).