100 % - х
30 % - 6
х=100*6/30=600/30
х=20
30%=6
10%=6:3=2
60%=12
90%=18
100%=20
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100 % - х
30 % - 6
х=100*6/30=600/30
х=20
30%=6
10%=6:3=2
60%=12
90%=18
100%=20