Question 187585
Camille has 19 coins consisting of nickels, dimes, and quarters. The value of the coins is $1.60. If she has six times as many nickels as quarters, then how many of each does she have? 
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Equations:
Quantity Equation: n   +   d   +  q = 19
Value Equation...:5n   + 10d   +25q = 160 cents
Quantity Eq......:n = 6q
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Rearrange the 3 equation:
 n   +   d   +  q = 19
5n   + 10d   +25q = 160 
 n   +   0   - 6q = 0
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Use any method you know to solve this system of three equations to get:
n = 12
d = 5
q = 2
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Cheers,
Stan H.