Question #f7dd5

1 Answer
Oct 2, 2017

Answer:

Follow explanation

Explanation:

X is the amount from acid solution 20% and (400-X) is the amount from acid solution 60%. Final volume will be 400 mL of 40% acid solution.

#Xtimes0.20 + (400-X)times0.60 = 400times0.40#

#0.2X + 240 - 0.6X = 160#

#240-160 = 0.4X#

#80 = 0.4X#

#200 mL =X#

Take 200 mL from 20% acid solution and 200 mL from 60% acid solution, mix well and you will get 40% acid solution (volume 400 mL).