Hi,         

Let x and (x+.30)represent the cost of regular and premium gas respectively

Question States:

  9x + 16(x+ $0.30) = $58.55

            25x = $58.55 - 16*$0.30

            25x = $53.75

              x = $53.75/25

              x = $2.15, cost of regular, premium costs $2.45  ($2.15 + $0.30)



CHECKING our Answer

  9*$2.15 + 16*$2.45 = $19.35 + $39.20 = $58.55 

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