Mathematics, 11.07.2019 07:00 lazavionadams81

How many gallons of fuel costing 3.35 per gallon must be mixed with 20 gallons of fuel costing 3.85 per callonm to be obtain misrure costing 3.55?

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How many gallons of fuel costing 3.35 per gallon must be mixed with 20 gallons of fuel costing 3.85...