The average of 21 numbers is 12. The average of the first 11 numbers i – McqOptions

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1.	The average of 21 numbers is 12. The average of the first 11 numbers is 9 and the average of the last 11 numbers is 15. What is the value of the middle number?
A.	10
B.	11
C.	12
D.	13
Answer» D. 13

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