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a=b+2½=b+5/2
a+b=20
(b+5/2)+b=20
2b+5/2=20
2b=20-5/2
2b=40/2 - 5/2
2b=35/2
4b=35
b=35/4
a+b=20
a=20-35/4=80/4-35/4=45/4
b:a=35/4 : 45/4 = 7 : 9
Jadi b/a = 7/9