SOLUTION: At the local pet store, zebra fish cost $2.10 each and neon tetras cost $1.85 each. If Marsha bought 13 fish for a total cost of $25.80, not including tax, how many of each type of

Question 755498: At the local pet store, zebra fish cost $2.10 each and neon tetras cost $1.85 each. If Marsha bought 13 fish for a total cost of $25.80, not including tax, how many of each type of fish did she buy?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
At the local pet store, zebra fish cost $2.10 each and neon tetras cost $1.85 each.
If Marsha bought 13 fish for a total cost of $25.80, not including tax, how many of each type of fish did she buy?
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Equations:
Quantity Eq::: z + n = 13
Value Eq::::210z+185n= 2580 cents
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Modify for elimination:
210z + 210n = 210*13
210z + 185n = 2480
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Subtract and solve for "n":
25n = 250
n = 10 (# of neon tetra fish)
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Solve for "z":
z + 10 = 13
z = 3 (# of zebra fish)
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Cheers,
Stan H.
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