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a+b =13
a+c = 25
kurangkan
b - c = -12
b + c = 20
jumlahkan
2b = 8
b = 4
a = 13- b = 9
c = 20 - b = 16
b)
a+b = 27
a+c = 29
kurangkan
b - c = - 2
b + c = 38
jumlahkan
2b = 36
b = 18
a- 27-b = 9
c = b+2 = 20