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If n is the variable then it's making the two sides equal to one another. So the question is what is n, if n/12 = 20/30 ?
First of all 20/30 is 2/3 when that fraction is reduced. Once you have n/12 = 2/3 ... isolate the n, in the equation so... n = (2/3) x 12 .... therefore n = 8.
We can prove this by substituting 8 to n ....
8/12 is equivalent to 2/3 whereas 20/30 is equivalent to 2/3.
Thus 2/3 = 2/3.
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