no 1-4 plisss buat cara

1. 15:35 = 3:7
2. 18:42 = 9 : 21= 3:7
3. 20/100 x 80 = 16 kg
80 - 16 = 64 kg
4. dewasa = 3/5 x 80 = 48 sepatu
anak anak = 80 - 48 = 32 sepatu