SOLUTION: How much water should be added to 30 liters of 40% acid solution to reduce to 30% solution?

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Question 345627: How much water should be added to 30 liters of 40% acid solution to reduce to 30% solution?
Found 2 solutions by ewatrrr, Fombitz:
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
Hi,
Note: the % States the amount of acid in the TOTAL Solution.
Question states the following to be true of the amount of acid present.
.40* 30L = 12L of acid
.
Let V be the TOTAL Amount of the 30% Solution:
.
.30*V = 12
V = 40 L
There would need to be 10L of water added.
.
Check Your Answer:
.30*40L = 12 L of acid in that solution, as well.

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of water (0% solution).
0%28A%29%2B40%2830%29=30%28A%2B30%29
1200=30A%2B900
30A=300
highlight%28A=10%29liters