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1/10a + 1/25b = 0,9kg /*10
a + b = 15kg
a + 10/25b = 9kg
a + b = 15kg
10/25b - b = 9kg - 15kg
-15/25b = -6kg
b = 10 kg
a = 15kg - b
a = 5kg
b = 10kg
Odp. Należy wziąć 10kg solanki 4% i 5kg solanki 10%.
y - ilość 4% solanki
15 kg - masa po rozpuszczeniu
x + y = 15 / * (-10)
0,1x + 0,04y = 0,9/*100
( -10x - 10y = -150
+
( 10 + 4y = 90
_____________
x + y = 15
y = 10
x + 10 = 15 / -10
y = 10
x = 5
y = 10
Trzeba wziąć 5kg solanki 10% i 10kg 4%