Odpowiedzi

2009-11-02T20:15:12+01:00
69Ga = x
7Ga = 100% - x
mat = 69,72u

69,72u = 69 × x + 7 × (100% - x) : (100% wszystko)
6972% = 69x + 700% + 7x
6272% = 76x
x = 82,53%
100% - 82,53% = 17.47%