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When identifying percentages , how do you set up the cross multiplication?

I get how to get the answer, with the multiplying and all but don’t get how you are supposed to know how to set up the cross multiplication?

Here’s an example of what I mean:

When Identifying Percentages How Do You Set Up The Cross Multiplication I Get How To Get The Answer With The Multiplying And All But Dont Get How You Are Suppos class=