?Seven hundred gallons of 89-octane gasoline is obtained by mixing 87-octane gasoline with 92-octane gasoline. How much of each type of gasoline is required to obtain the 700 gallons of 89-octane gasoline? Use this system of linear equations there x and y represent the number of gallons of the 87-octane gasoline and 89-octane gasoline.
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A. 87?-octane: 89 gal; 92-octane: 280 gal ?
B. 87?-octane: 280 gal; 92-octane: 420 gal?
C. 92??-octane: 89 gal; 87-octane: 280 gal
D. ??87-octane: 420 gal; 92-octane: 280 gal
E. ??92-octane: 280 gal; 87-octane: 89 gal
Answer: D
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