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what is 2/5=n/20

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First you cross multiply, then solve for the variable:

If given a/b = c/d (a is the variable in this example, which is why it is bold) you would multiply a and d, and b and c so it ends up being a*d = b*c, then you solve for a.  So if it were a/2 = 3/6, you would end up with:

6a = 6

Then you would solve for a by dividing both sides by the number in front of the variable (the coefficient). In this case, 6a divided by 6 is a, and 6 divided by 6 is 1.  So you would end up with a = 1.