To say the tank is 3/5ths fulls means there are (3/5)x liters of fuel.
To say the tank is 9/20ths full means there are (9/20)x liters.
Can you use these expressions, to form an equation, based on the given information that using 6 liters of the first amount leaves the second amount? :cool:
The six liters used 3/5 - 9/20 = 12/20 - 9/20 = 3/20 of a tank. Since 6 liters is 3/20 of a tank, then 2 liters is 1/20 of a tank. So how much is the whole tank? :wink:
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