30% - 270
100%- x
x=270*100:30= 900
640:100%*55%= 352
55% от 640 =352
30% от 900=270
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30% - 270
100%- x
x=270*100:30= 900
640:100%*55%= 352
Verified answer
55% от 640 =352
30% от 900=270