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30% 60% 40%
+ =
x 200-x 200g
30x + 60(200-x) = 40*200
30x + 12000 - 60x = 8000
-30x = -4000
-x = -133 1/3 (ułamek)
x = 133 1/3
x = 133 [gramy]
200 - 133 = 64 [gramy]
Odp. 133 gramy 30% i 64 gramy 60%.
:)