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sqdancefan
The chart tells you the greatest amount of sap collected from any one tree is 1 gallon, and the least amount collected is 1/4 gallon.

1 gallon is 4 times as great as 1/4 gallon.

? = 4
ythø
To find the answer, subtract 1/4 from 1, the lowest and highest numbers. The answer is 3/4. As a decimal, it is 0.75. 
Hope this helps!