Answer:
40 Liter of 40% solution and 80 Liter of 25% solution should be mixed to obtain 120 liters of a 30% solution
Explanation:
Let the volume of the 40% and 25% solution be x and y.
x + y = 120....(1)
Percentage of the [tex]HNO_3[/tex] will equal to the sum percentage of [tex]HNO_3[/tex] in x anf y volumes.
[tex]40\%of x+25\%of y=30\% of 120[/tex]
[tex]0.40\times x+0.25\times y=0.30\times 120[/tex]
8x + 5y = 720....(2)
Solving equation (1) and (2) we get:
x = 40 L , y = 80 L
40 L of 40% solution and 80 L of 25% solution should be mixed to obtain 120 liters of a 30% solution
