15. Soal: Jika 9 + 6 = 33, 7 + 5 = 35, 4 + 3 = 17, maka 8 + 6 = ?
Jawaban: 63
16. Soal: Jika 4 + 5 = 54, 7 + 2 = 92, 3 + 6 = 63, maka 8 + 4 = ?
Jawaban: 84
17. Soal: Jika 5 + 2 = 37, 8 + 7 = 132, 9 + 6 = 78, maka 6 + 3 = ?
Jawaban: 111
18. Soal: Jika 5 + 4 = 35, 8 + 6 = 86, 3 + 7 = 47, maka 7 + 9 = ?
Jawaban: 97
19. Soal: Jika 3 + 2 = 27, 8 + 6 = 214, 4 + 5 = 37, maka 5 + 3 = ?
Jawaban: 57
20. Soal: Jika 7 + 4 = 311, 5 + 8 = 524, 2 + 6 = 218, maka 3 + 7 = ?