The average of 30 numbers is 12. The average of the first 20 of them i – McqOptions

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1.	The average of 30 numbers is 12. The average of the first 20 of them is 11 and that of the next 9 is 10. The last number is
A.	60
B.	45
C.	40
D.	50
Answer» E.

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