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In many mathematical applications letters represent quantities that are being solved for and that are not initially known. There are also applications in computer science where calculations have to be made using math in base other than ten. For example hexadecimal numbers are sometimes used to locate a spot in a system dump in order to troubleshoot a problem. In hex arithmetic, letters A through F could represent 10 through 15, the number 10 equaling 16.

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Q: When do letters represent numbers in math?
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