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Sagot :
30 gallons were used from the tank with the octane rating of 90.
Volume calculation
The used volume of the two tanks is unknown, so we can call x the volume of the 90 tank and y the volume of the 130 tank.
From this we can perform the following expression:
[tex]x \times 90 + y \times 130 = 80 \times 115[/tex]
[tex]9x + 13y = 920[/tex] [1]
As the sum of the two volumes should give the final volume, we have:
[tex]x + y = 80[/tex] [2]
Substituting the y value of expression 2 into expression 1 we have:
[tex]9x + 13 (80-x) = 920[/tex]
[tex]4x = 120[/tex]
[tex]x = 30[/tex]
So, 30 gallons were used from the tank with the octane rating of 90.
Learn more about volume calculation in: brainly.com/question/22391800
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