Express the numbers in lowest form and then if it's an improper number, change it into a mixed number. :))
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It is ratio.
The ratio of ethanol to WHAT!
The numerator of the second ratio and the denominator of the first ratio are called the means, and the numerator of the first ratio and the denominator of the second ratio are called the extremes. The product of the means equals the product of the extremes.
I guess you mean the ratio of the areas; it depends if the 2 rectangles are "similar figures"; that is their matching sides are in the same ratio. If they are similar then the ratio of their areas is the square of the ratio of the sides.
You express ratio as a fraction. For instance, the ratio of 3 to 4 is 3/4, or .75