. Jill 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

7.5 tablespoons of salt

Explanation:

The old aquarium had 20 gallons of water while the new aquarium had 50 gallons of water.

If 20 gallons of water required 3 tablespoons of salt

50 gallons of water will require: 50 x 3/20 = 7.5 tablespoons of salt

Hence, 7.5 tablespoons of salt should be added to her new aquarium.

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just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project