The average of 12 numbers is 25.5. The average of the first six numbers is 22.4 and that of the last three numbers is 28.2. The $$7^{th}$$ number is 5 less than the $$8^{th}$$ number but 10 less than the $$9^{th}$$ number. What is the average of the $$8^{th}$$ and $$9^{th}$$ numbers.

A

32.6

B

29.4

C

29.8

D

31.5