The average of thirteen numbers is 47. The average of the first three – McqOptions

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1.	The average of thirteen numbers is 47. The average of the first three numbers is 39 and that of the next seven numbers is 49. The 11th number is two times the 12th number and the 12th number is 3 less than the 13th number. What is the average of 11th and 13th numbers?
A.	55.5
B.	54.5
C.	56
D.	57
Answer» E.

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