The average of $25$ result is $18$ .The average of $1^{s t} 12$ is $14$ and that of last $12$ is $17$ .Find the $13^{t h}$ result.

75

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76

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77

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78

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Solution

The correct option is D $78$
$13^{t h}$ result $=$ Sum of $25$ results $-$ Sum of $24$ results

$= 18 \times 25 - (14 \times 12 + 17 \times 12$ )

$= 450 - (168 + 204)$

$= 450 - 372$

$= 78$

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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.

The correct option is D 7813th result =Sum of 25 results−Sum of 24 results=18×25−(14×12+17×12)=450−(168+204)=450−372=78

The average of $25$ result is $18$ .The average of $1^{s t} 12$ is $14$ and that of last $12$ is $17$ .Find the $13^{t h}$ result.

The correct option is D $78$
$13^{t h}$ result $=$ Sum of $25$ results $-$ Sum of $24$ results

$= 18 \times 25 - (14 \times 12 + 17 \times 12$ )

$= 450 - (168 + 204)$

$= 450 - 372$

$= 78$