The average of 5 quantities is 6. The average of 3 of them is 4. What is the average of remaining 2 numbers?

(A) 9
(B 10
(C) 8
(D) 9.5

Solution:
Average of 5 quantities = 6
5 X 6: 30
Average of three quantities = 4
3 X 4: 12
30 – 12 = 18
The average of two no’s is
18/2=9

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