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The average of 13 result is 68. The average of first seven is 63 and that of the last seven is 70 , the seventh result is?

47
65.5
73.5
94

Correct Answer: 47

Explanation:

Seventh Result = sum of first 7 results + sum of last 7 results - sum of all 13 results.
⇒ Seventh Result = (7 x 63) + (7 x 70) - (13 x 68 )
=47

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