tolong jawab nomor 12-20 ya

12. 5,5 cm × 2.500.000 = 13.750.000 cm = 137.5 km
13. B : C = 4 : 7 → 4 + 7 = 11
A → 3/11 × 33 = 9 kg
15. Fathet : Uncle = 8 : 5 → 8 + 5 = 13
Uncle now = 5/13 × 91 = 35 years old
Une two years more = 35 + 2 = 37 years old