The average of ten numbers is 32.5. The averageoffirst four numbers is 25.6 and thatofthe last three numbers is 38.2. The 5th number is 50% more than the 6th number and 8 less than the 7th number. Whatis the average of 5th and 7th numbers?

A

42

B

41

C

42.4

D

41.5