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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.

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. Correct Answer 370

The total of the results = 20 * 200 = 4000 The total of the first 12 results = 12 * 250 = 3000 The total of the last 7 results = 7 * 90 = 630 13th term = sum of 20 results – sum of first 12 results – sum of last 7 results 4000 – 3000 – 630 = 370

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