The amount of gasoline that was in the tank before refilling it was 11.5 gallons. Due to the above, it lacked 8.5 gallons to refill it again.
To calculate how many gallons were left to refill the tank, you need to know how much gasoline was in the tank.
According to the statement, the tank required [tex]8 \frac{5}{10}[/tex] to fill up, then to know how much gasoline it had we must subtract this amount from the maximum capacity of gasoline that the tank requires as shown below:
[tex]8\frac{5}{10}[/tex] = 8.5 gallons
20 - 8.5 gallons
= 11.5 gallons
Based on the above, the number of gallons in the tank was 11.5 gallons of gasoline.
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