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burger 5
kentang 2
jadi 5+2x10= 5+20=25
1s+2b=20
1b+2k=9
1b+1k x 1s =??
persamaan 1 masukkan
3s=30
s=30/3
s=10
masukkan persamaan 2
1s+2b=20
10+2b=20
2b=20-10
b=10/2
b=5
masukkan persamaan 3
1b+2k=9
5+2k=9
2k=9-5
k=4/2
k=2
jadi 1b+1k x 1s
=5+2 x 10
=5+20
=25
semoga membantu