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a = bilangan yg besar
b = bilangan yg kecil
maka model matematikanya
a - b = 25... (1)
2a - b = 175... (2)
a - b = 25
b = 25 - a... (3)
subtitusikan persamaan (3) ke persamaan (2)
2a - b = 175
2a - (25 - a) = 175
2a - 25 + a = 175
3a - 25 = 175
3a = 175 + 25
3a = 200
a = 200 = 66 2 ....(4)
3 3
Subtitusikan persamaan (4) ke persamaan (3)
a - b = 25
200 - b = 25
3
200- 25 = b
3
200 - 75 = b
3 3
125 = b
3
41 2 = b
3