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A Supposed 2500 Gallon Pond Reads A Salinity Of 0.4ppt. Fifty Pounds Of Salt Is Added & The Next Day, Salinity Reads 2.8ppt. What Is The Actual Amount Of Water In The Pond? - Math Discussion

A supposed 2500 gallon pond reads a salinity of 0.4ppt. Fifty pounds of salt is added & the next day, salinity reads 2.8ppt. What is the actual amount of water in the pond?