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Answer 1 · 2017-10-02T10:29:28

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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).