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40 + 60 = 100
jadi A + B=
3/7X 100 + 4/7X 100
42,85 + 57,15 = 100
b. =2:3c
b. + c = 100
2:3c + c = 100
5:3 c. = 100
c. = 3 :5 x100
c. = 60
maka
b. = 40
a. =30
a+b = 70?