SSC CGL 4 Mar 2020 Shift 1 Paper

The average of twelve numbers is 45.5. The average of the first four numbers is 41.5 and that of the next five numbers is 48. The 10^th number is 4 more than the 11^th number and 9 more than the 12^th number. What is the average of the 10^th and 12^th numbers?