The average of &n

Question

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

Options:

A . 78

B . 70

C . 72

D . 76

Answer: Option A

Clearly 13th result=(sum of 25 results)-(sum of 24 results)
=(18*25)-(14*12)+(17*12)
=450-(168+204)
=450-372 =78.

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