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(B) Let the capacity of the tank be $27$ litres.						Step			Ordinary Petrol (litres)			High-speed Petrol (litres)							$I$. Initial fill			$27$			$0

Vedclass · Accepted Answer

$48 \frac{4}{27} \%$

Vedclass · Answer

(B) Let the capacity of the tank be $27$ litres.						Step			Ordinary Petrol (litres)			High-speed Petrol (litres)							$I$. Initial fill			$27$			$0$							$II$. $1/3$ empty ($18$ left),add $9$ high-speed			$18$			$9$							$III$. $1/3$ empty ($18$ left),add $9$ ordinary			$12 + 9 = 21$			$6$							$IV$. $1/3$ empty ($18$ left),add $9$ high-speed			$14$			$4 + 9 = 13$			The total volume is $27$ litres,and the volume of high-speed petrol is $13$ litres.Percentage of high-speed petrol = $\frac{13}{27} 	imes 100 = 48 \frac{4}{27} \%$.

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