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20-x%
x= 20* 100% /160
x = 12,5
2. 30%-75
100%-x
x=100%*75/30%
x=250
3. 15-100%
45-x
x= 45*100%/15
x=300 %
4 . 180-100%
x-66 2/3
x= 180*66 2/3 podzielić przez 100 %
x= 120
5.33 1/3 % - 50
100% - x
x= 100 % * 50 podzielić przez 33 1/3 %
x= 150