Yang bisa tolong di jawab

Buku = 40°/360° x alat tulis
18 lusin = 1/9 x alat tulis
total alat tulis = 18 x 9 = 162
pensil = 120°/360° x 162 = 54 lusin
spidol = 60°/360° x 162 = 27 lusin
pulpen = 162-18-54-27 = 63 lusin