SOLUTION: A​ sparkling-water distributor wants to make up 400 gal of sparkling water to sell for $8.00 per gallon. She wishes to mix three grades of water selling for ​$14​.00, ​$3β€

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Question 1151891: A​ sparkling-water distributor wants to make up 400 gal of sparkling water to sell for $8.00 per gallon. She wishes to mix three grades of water selling for ​$14​.00, ​$3​.00, and​ $4.50 per​ gallon, respectively. She must use twice as much of the​ $4.50 water as the $ 3.00, water. How many gallons of each should she​ use?
Answer by josgarithmetic(39618)   (Show Source): You can put this solution on YOUR website!
INGRED PRICE    QTY         COST

$14.00          y           14y

$3.00           x            3x

$4.50          2x            9x

----------------------------------

TOTAL         400         12x+14y
              gallons      dollars


Simplify and solve this system of equations.
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