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How many liters of a solution that 15% salt must be added to

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How many liters of a solution that 15% salt must be added to [#permalink] New post 13 Mar 2007, 19:49
How many liters of a solution that 15% salt must be added to 5 liters of a solution that 8% salt so that the resulting mixture is 10% salt?

15/100(L) + 8/100(5) = 10/100(L)

This is how I solved. Obviously, it's wrong. Can anyone explain why?
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 [#permalink] New post 13 Mar 2007, 20:12
It should be:

15/100(L) + 8/100(5) = 10/100(5+L) because the resulting solution volume would be 5 +L.

Solving for L, you will get 2litres of solution need to be added.

thanks!

Nitin
  [#permalink] 13 Mar 2007, 20:12
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How many liters of a solution that 15% salt must be added to

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