SOLUTION: Having a lot of trouble with this problem any help is appreciated. Carmen needs 30ml of 10% HCI solution, but she has only 5% HCI and 30% HCI solutions. How much of each solutio

Question 840410: Having a lot of trouble with this problem any help is appreciated.
Carmen needs 30ml of 10% HCI solution, but she has only 5% HCI and 30% HCI solutions. How much of each solution should Carmen use to make the 30ml of 10% HCI solution?
Found 2 solutions by Alan3354, josgarithmetic:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Do it like this one. Only the numbers are different.
-----------
Amanda wants to make 8 gal. of a 20% saline solution by mixing together a 56% saline solution and a 8% saline solution. How much of each solution must she use?
================
e = amount of 8%
f = amount of 56%
---
e+ f = 8 (total solution)
8e + 56f = 20*8 (total saline)
---
e+ f = 8
e + 7f = 20
------------ Subtract
-6f = -12
f = 2
e = 6
Answer by josgarithmetic(39616) (Show Source): You can put this solution on YOUR website!
This will only be approximate, because you need to know if the percents are w/w, or w/v, and you also need to know the densities.

and
Solve the system for u and v.
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