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9 (kg)-- 5%
x (kg)--10%
x= 9*10/5 = 18
2. roztwór 30%-- 70x wody + 30x soli
70x - 70%
70x+20kg - 75% -> 20kg - 5%
Z proporcji :
20kg - 5%
x - 100%
x= 20*100/5=400 kg