Posted by kattie on Tuesday, January 4, 2011 at 12:18am.
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

pre algebra  Henry, Wednesday, January 5, 2011 at 9:24pm
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
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