Объясните как решать,плиз:((
1) m 1 -200 г
W 1 -25%
+m 2 - 300 Г
w 2 - 12%
---------------------------
w - ?
2)
m в-ва - 40 Г
w -20%
w 1 - 35%
----------------------------
m ( добавленного вещества ) - ?
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