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9+7+4=20
a)
9/20*100%= 45%
b)
7/20*100%=35%
c)
4/20*100%=20%
45%+35%+20%= 100%
Ps. znak " / " oznacza ulamek..
20x=100% /:20
x=5%
Anna 9*5%=45%
Barbara 7*5%=35%
Cecylina 4*5%=20%