The result of a number, when decreased by 66 2/3%, is 432. Find the number.
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Decreased by 66 2/3% is different than "reduced" by 66 2/3%; the first implies subtraction, the second multiplication
Let X be the unknown number, when X is decreased by delta the result is 18. The delta is 66.666% of X
X - .6666x = 18
X (1-.6666) = 18
X(.333) = 18
X = 18/.33333 = 54
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