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G : B = 8 : 5 => 5G = 8B . 8B - 5G = 0...(1)B : T = 1 : 2 => 2B = T. => 2B - T = 0...(2)
T - G = 4000 . ..(3)
ambil (1) dan (2) eliminasi B, maka (2)×4
8B -4T = 0
8B -5G = 0
---------------- -
-4T + 5G = 0...(4)
ambil (3) dan (4), eliminasi T, maka (3)×4
4T -4G = 16.000
-4T +5G = 0
------------------------- +
G = 16.000.
dari (3) , =>T - G = 4.000
T -16.000 = 4.000
T = 4.000 + 16.000
T = 20.000,-
dari (1)=>8B - 5G = 0
8B = 5G
8B = 5×16.000
8B = 80.000
B = 10.000,-
Jadi harga beras 10.000,-
Telur = 20.000,-
Gula = 16.000,-
beras : telur = 1 : 2
gula : beras : telur = 8 : 5 : 10
selisih harga telur dan gula = Rp.4.000
harga telur = 10/2 ×Rp. 4.000 = Rp. 20.000