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Basic Math/what's the dots about?

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Question
9:x::5:300 value of x

Answer
Hello, Sue.

The dots indicate that you have a ratio. 9:x = 5:300 or 9/x = 5/300.

To solve this, first cross-multiply. This gives you 5x = 2700. Next, divide both sides by 5, giving you an answer of x = 540.

Answer: x = 540.

I hope this helps.

Regards,
John

Basic Math

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John Zalewski

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I can help you solve problems involving fractions, decimals, ratios, and algebra. I can teach you how to do math faster, and even in your head. I can teach math definitions, and help you study, if necessary. Please do not ask any graphing, trigonometry, or calculus questions. Try to work through homework questions before asking for assistance.

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I routinely process numbers of all kinds in my head, without need of a calculator.

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I was an A math student while in high school.

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