Tolong kerjain nomor 11

baris
1 = 7 kursi 9 = 55
2 = 13kursi 10= 61
3 = 19 kursi 11 = 67
4= 25 12 = 73
5 = 31 13 = 79
6 = 37 14 = 83
7 = 43 15 = 91
8 = 49
Totalnya 735 kursi