The average of 25 results is 18; that of first twelve is 14 and of last twelve is 17. Find the thirteenth result.

The average of 25 results is 18; that of first twelve is 14 and of las

1.	The average of 25 results is 18; that of first twelve is 14 and of last twelve is 17. Find the thirteenth result.
A.	68
B.	78
C.	79
D.	87
Answer» C. 79

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The average of 25 results is 18; that of first twelve is 14 and of last twelve is 17. Find the thirteenth result.

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