SOLUTION: The average of 30 numbers is 12. The average of first 20 of them is
11 and that of next 9 is 10. The last number is :
Algebra.Com
Question 830715: The average of 30 numbers is 12. The average of first 20 of them is
11 and that of next 9 is 10. The last number is :
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
30*12-20*11-9*10=n
n=50
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