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B = 63 - A
B = 63 - 45
B = 18
Perbandingan :
A : B = 45 : 18
A : B = 5 : 2 (bentuk sederhana)
2.) A - B = 12
B = A - 12
B = 48 -12
B = 36
Perbandingan :
A : B = 48 : 36
A : B = 4 : 3
3.) A - B = 15
A = 15 + B
A = 15 + 45
A = 60
Perbandingan :
A : B = 60 : 45
A : B = 4 : 3
4.) A + B = 72
B = 72 - B
B = 72 - 48
B = 24
Perbandingan :
A : B = 48 : 24
A : B = 2 : 1
5.) A - B = 36
A = 36 + B
A = 36 + 54
A = 90
Perbandingan :
A : B = 90 : 54
A : B = 5 : 3