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AB= 20kg
BC = 35kg
CD= 55kg
Ditanya : Berat A+D
Jawab : A+B = 20
=20/AB
=20/2
=10
AB=masing - masing 10kg
B+C= 35
10+C=35
C=35-10
C=25
C+D =55
25+D=55
D=55-25
D,=30
Jadi A+D = 10+30
AD=40