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Figuring solution/mixture percentages

I am trying to confirm what the statement '10% solution with water' really means when trying to mix a detergent and water together for cleaning purposes... does it mean, using 20 gallons water I need to add 2 gallons of my detergent to create a 10% solution (totaling 22 gallons of mixture)? or, does it mean 18 gallons of water and 2 gallons of detergent to create a 10% solution (totaling 20 gallons of mixture)?

Michael Tuller
Electronics/Biomedical - Lake Oswego, Oregon, USA
2004

Hi Michael. It means the latter. As a thought experiment, suppose the instructions were to make a mix with 10% solution of part A plus 7% solution of part B, and think about what you would do if it meant the former. Good luck.

Ted Mooney, P.E.
Striving to live Aloha
(Ted can offer longterm or instant help)
finishing.com - Pine Beach, New Jersey
2004

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