Answer:
7 L of 30% acid
3 L of 50% acid
Step-by-step explanation:
If x is the volume of 30% acid, and y is the volume of 50% acid, then:
x + y = 10
0.30 x + 0.50 y = 0.36 (10)
Solve the system of equations using substitution.
0.30 (10 − y) + 0.50 y = 3.6
3 − 0.30 y + 0.50 y = 3.6
0.20 y = 0.6
y = 3
x = 7
The chemistry teacher needs 7L of 30% acid and 3L of 50% acid.
