The average of twelve numbers is 55.5. The average of the first four i – McqOptions

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1.	The average of twelve numbers is 55.5. The average of the first four is 53.4 and that of next four is 54.6. The 10th number is greater than the 9th number by 3 but less than the 11th and the 12th numbers by 2 and 3 respectively. What is the average of the 9th and 11th numbers?
A.	57
B.	56
C.	56.6
D.	57.5
Answer» E.

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