pre algebra
posted by kattie on .
in vanessas coin bank there are 4 times as many quarters as nickels, 2 fewer dimes than nickles and 15 pennies.the total amount in the bank is 5.80. how many of each coin are in the bank

I believe the amount in the bank should be 5.70. If not, check and make sure all INFO is correct.
Nickels = X,
Qtrs = 4X,
Dimes = (X  2),
Pennies = 15.
5X + 25*(4X)+ 10(X  2)+ 15 = 570.
5X + 100X + 10X  20 + 15 = 570,
115X  5 = 570,
115X = 575,
X = 575 / 115 = 5.
Nickels = X = 5.
Quarters = 4x = 4*5 = 20,
Dimes = X  2 = 5  2 = 3,
Pennies = 15