135k views
1 vote
ill decides to move her fish from a 20 gallon aquarium to a 50 gallon aquarium. She added 3 tablespoons of salt to her old aquarium. If she wishes to maintain to same salinity level, how many tablespoons should she add to her new aquarium?

User Pontus
by
8.2k points

1 Answer

5 votes

In the old aquarium, 3 tablespoons of salt were used for 20 gallons. That's a conversion ratio of


\frac{3\,\rm tbsp}{20\,\rm{gal}}=0.15\,(\rm tbsp)/(\rm gal)

That is, for every gallon of water in the aquarium, there was 0.15 tbsp of salt. So a 50 gallon aquarium, Ill should add


(50\,\rm{gal})\left(0.15\,(\rm tbsp)/(\rm gal)\right)=7.5\,\rm{tbsp}

to maintain the salinity.

User Drstein
by
8.3k points