There's no specific answer, except to say that the number of nickels must be even (otherwise the total would end in 5 rather than 0). You could have combinations like
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There are 250.
Armored car services deliver boxes of dimes worth $250. That's fifty $5.00 rolls.
A quarter is 25 cents. Two dollars is 200 cents and 10 nickels is 50 cents, for a total of 250 cents. That's the same as 250/25 = 10 quarters.
10 quarters = 250 cents (25 x 10) 7 dimes = 70 cents (7 x 10) 250 + 70 = 320 10 quarters and 7 dimes equal 320 cents. In other words, $3.20 or 3 dollars and twenty cents.
If all coins were dimes he would have $1.30. Every quarter that replaces a dime increases the total by 15c. The total has to be increased by $1.20 which is 15c x 8. He has 8 quarters and 5 dimes.