SOLUTION: SHELLIE IS A GRADUATE STUDENT BREEDING OPIHI IN A LABORATORY SETTING. SHE FOUND THAT THE OPTIMAL SALT CONCENTRATION FOR HER EXPERIMENT TO SUCCEED IS 4%. IF SHE STARTS OFF WITH 10

Question 1109331: SHELLIE IS A GRADUATE STUDENT BREEDING OPIHI IN A LABORATORY SETTING. SHE FOUND THAT THE OPTIMAL SALT CONCENTRATION FOR HER EXPERIMENT TO SUCCEED IS 4%. IF SHE STARTS OFF WITH 100 LITERS OF 2.5% SOLUTION, HOW MUCY 5.5% SOLUTION MUST SHE ADD TO CREATE HER TARGET SALT CONCENTRATION OF 4%?
Answer by greenestamps(13203) (Show Source): You can put this solution on YOUR website!

The target percentage of 4.0 is exactly halfway between 2.5 and 5.5. That means the two ingredients must be mixed in equal amounts.

100 liters of 2.5% means she needs 100 liters of 5.5%.
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