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The sum of three numbers is 81 and their ratio is 3:7:17. What is the value of the smallest number?

Add up the ratios 3:7:17 to get 27.
Since ratios can be scaled, we can scale the ratios to have a sum of 81 by multiplying the ratios by 3,i.e.
3:7:17 ß 9:21:51.

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