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The average of 20 results is 200. If the average of the first 12 results is 250 and the average of last 7 results is 90, find the 13th result.

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The average of 20 results is 200. If the average of the first 12 results is 250 and the average of last 7 results is 90, find the 13<sup>th</sup> result.






 
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