The average of 22 numbers is 52. The average of the first 8 numbers is 48 and the average of next 11 numbers is 54. The $$20^{th}$$ number is 7 less than the $$21^{st}$$ number and $$21^{st}$$ number is 4 more than $$22^{nd}$$ number. What is the average of the $$20^{th}$$ and $$22^{nd}$$ numbers?

A

52

B

52.5

C

53

D

53.5