How do you know where to put the "x" in the proportions?

How do you know where to put the "x" in the proportions?
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answer:Percent problems translate very directly from English to math. I’ll show you with an example: The problem is, “What percent of 40 is 10?” “What” is what you’re solving for. This should be your x. “Per cent” – per means division, cent means 100. “Of” – here’s a protip, in these kinds of problems, “of” means multiply. “Is” means equals. Here’s where you put your = sign. Now we have a translation for each and every word. The problem becomes: x/100 * 40 = 10 And now you simply have to solve for x. Divide by 40 and multiply by 100 to get 25. Works every time. Here’s another example: “What is 20% of 200?” What: x Is: = %: /100 Of: * x = 20/100 * 200 x = 40
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