tolong jawab y kakak pakai cara

1) (2x45)+(2x25)=90+50=140. 2)sepeda72orang :8=9x5=45org =bus. 3)a18:24=3:4. b24:72=1:3. maaf jika salah

7) K = 2x (45 + 25)
K = 2x (70)
K = 140
Perbandingan = 45 : 140 = 9:28