100% - 88% = 12%
12*420/100 = 50,4 (кг)
100% - 30% = 70%, т.е.
Тогда (50,4:70)*100 = 72 (кг)
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100% - 88% = 12%
12*420/100 = 50,4 (кг)
100% - 30% = 70%, т.е.
Тогда (50,4:70)*100 = 72 (кг)