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Question

The average of 25 result is 18.The average of 1st 12 is 14 and that of last 12 is 17.Find the 13th result.

A
75
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B
76
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C
77
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D
78
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Solution

The correct option is D 78
13th result =Sum of 25 resultsSum of 24 results

=18×25(14×12+17×12)

=450(168+204)

=450372

=78

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