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100% - 80% = 20%
b) 20 %
1/5=2/10
10/10=100%
8/10=x
x= 8/10*100%/ 10/10= 800/10/1= 80*1=80%
100%-80%= 20%
odp. B :)
liczę na naj ;p
4-x
x=4 razy 100dzielone na 5=80
100-80=20