Answer:

Step-by-step explanation:
Let x represent the amount of 4% solution and y represent the amount of 10% solution.
⇒ x + y = 100 ..................(1)
x liters of the 4% solution gives us the expression 0.04·x
y liters of the 10% solution gives us the expression 0.10·y
100 L of the 8% solution gives us 0.08 × (100) = 8
⇒ 0.04·x + 0.10·y = 8 ...........(2)
This gives us the system of equations (1) and (2)
To solve this, we will use substitution.
Substituting x = 100 - y from equation (1) into equation (2). We get,

Substitute this value of y into the first equation:
