If you remember the basic diagram:

Concentration of First Solution
Parts of First Solution Needed
Required Concentration
Concentration of Second Solution
Parts of Second Solution Needed


    You should be able to calculate:
  1. The proportion of sources needed to give a stated strength
  2. The amount of sources needed to prepare a specified amount of a stated strength
  3. How much of one source to add, given a specified amount of the other sources
  4. How much active ingredient must be added to increase the strength of mixture/solution
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