The average of thirteen numbers is 80. The average of the first five n – McqOptions

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1.	The average of thirteen numbers is 80. The average of the first five numbers is 74.5. And the average of the next five numbers is 82.5. 11th number is 6 more than 12th number. And 12th number is 6 less than 13th number. What is the average of 11th and 13th numbers?
A.	87
B.	86
C.	86.5
D.	87.5
Answer» B. 86

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