Question

What amount of a 40% acid solution must be mixed with 200 mL 10% solution to produce a 20% solution?

Answer 1

Answer:

Step-by-step explanation:

(x + 200)20 = 200(10) + x(40)

20x + 4000 = 2000 + 40x

2000 = 20x

X = 100 mL