the average of 25 result is 18 first twelve them 14and that..., Average, General Mathematics

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Question:The average  of  $25$  result is  $18$ .The average of first twelve of them is  $14$ and that of  last twelve is  $17$ .The thirteenth result is :

A  $28$  
B  $78$  
C  $72$  
D  $85$

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+ AnswerB

+ ExplanationThirteenth result

 $= [25 xx 18 - (12 xx 14 + 12 xx 17)]$ 

 $= 78$

+ Report

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Question:The average of 2525 result is 1818.The average of first twelve of them is 1414and that of last twelve is 1717.The thirteenth result is :

A 2828

B 7878

C 7272

D 8585

B

Question:The average of $25$ result is $18$ .The average of first twelve of them is $14$ and that of last twelve is $17$ .The thirteenth result is :

A $28$

B $78$

C $72$

D $85$