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Bil. yg besar = a
Bil. yg kecil = b
a + b = 60
a - b = 30 -
2b = 30
b = 15
a = 15 + 30
a = 45
a-b=30
a+b=60
a=60-b
a-b=30
substitusi;
60-b-b=30
60-2b=30
30=2b
b=15
a-b=30
a-15=30
a=45
jadi kedua bilangan tersebut 45 dan 15