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GRE Math Formulas and Strategies
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The resulting equation is inversely proportional (not proportional, like a baking recipe). So, set up a proportional equation and then flip one of the sides. It is important to use the same units on each side! 15/9 = 21/x -> 15/9 = x/21 -> x=35.
shortest, longest
(l+2s)(w+2s)
(distance)/(rate) d/r
m-n
1/2
The 75th percentile is less than the average of the 60th and 90th because the tail points in the positive direction.
acute