Question 384188
How many ml of a 70% acid solution must be added to a 30% acid solution to get 100 ml of a 40% acid solution? 
:
Let x = amt of 70% solution required
then
(100-x) = amt of 30% solution required
:
.70x + .30(100-x) = .40(100)
:
You should be able to do this now.