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3hl = 300l = 300 000 ml - 1l = 1000 ml
3l -= 3 l = 3000 ml - x l
x = 3000 * 1000 / 300 000 = 30 ml
Odp. Należy wziąć 30 ml wody :D
100g = 1000 000 mg
50 mg
50 / 1000 000 = 0,00005 %