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A​ sparkling-water distributor wants to make up 200 gal of sparkling water to sell for $5.00...

A​ sparkling-water distributor wants to make up 200 gal of sparkling water to sell for $5.00 per gallon. She wishes to mix three grades of water selling for

$99​.00, ​$22​.00, and​ $4.50 per​ gallon, respectively. She must use twice as much of the​ $4.50 water as the $2.00, water. How many gallons of each should she​ use?

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