Ayam pak saiful 20 ekor. Peb pak saiful ,pak bakri ,pak ali 4:7:9.berapa jumlah ayam pak bakri dan pak ali?

Misal> Pak Saiful = S , Pak Bakri = B , Pak Ali = A
S : B : A = 4:7:9
S = 20
S = 20/4 = 5
S : B : A = (4x5) : (7x5) : (9x5)
              = 20 : 35 : 45
Jadi, jumlah ayam Pak Bakri dan Pak Ali adalah B + A = 35 + 45 = 80
              

20:4=5
5x7=35 = pak bakri
9x5=45 = pak ali