Question 41648
There are 3 nickels for each dime so (each dime + its associated 3 nickels) is worth 25 cents.
Use x for the number of dimes and y for the number of quarters
Using the value of the coins form equation 1
.25x +.25y=6.25
Multiply this equation by 4 to remove the decimals
x + y = 25
Using the number of coins form equation 2
4x+y=85
Subtract the first equation from the second to get
3x=60
so x = 20
so y (the number of quarters must be 5)
(There were  60 nickels, 20 dimes and 5 quarters (85 coins) with a value of $3.00+$2.00+$1.25=$6.25)