1.

A list contains nine numbers. The ratio of average of first five numbers, average of last five numbers and the average of all the numbers is 16 ∶ 14 ∶ 15. Upon adding 6 as the 10th number, there is no increase in average. What is the fifth number?

A. 4
B. 5
C. 6
D. 7
E. 8
Answer» D. 7


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