mohon di jawab please..pakai cara kerja ya...yg nomor 8

bilangan ganjil dari 2 sampai 30
3 5 7 9 11 13 15 17 19 21 23 25 27 29
= 3 + 5 = 8 = 48 + 15 = 63 = 143 + 25 = 168
= 8 + 7 = 15 = 63 + 17 = 80 = 168 + 27 = 195
=15 + 9 = 24 = 80 + 19 = 99
= 24 + 11 = 35 = 99 + 21 = 120
= 35 + 13 = 48 = 120 + 23 = 143

= 195 + 29 = 224