The average of 15 numbers is 7. If the average of the first 8 numbers – McqOptions

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1.	The average of 15 numbers is 7. If the average of the first 8 numbers is 6.5 and that of the last 8 numbers is 9.5, then the middle number is
A.	20
B.	21
C.	23
D.	18
Answer» D. 18

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