Maria is setting up a 20gal salt water fish tank. That needs to have a salt content of 3.5%. if she has water with 2.5% salt and water with 3.7% salt. How many gallons of water with 3.7% salt content must she use?

Question

Mathematics

Rosemary

20 October, 20:36

Maria is setting up a 20gal salt water fish tank. That needs to have a salt content of 3.5%. if she has water with 2.5% salt and water with 3.7% salt. How many gallons of water with 3.7% salt content must she use?

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Answers (1)

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Cannon Klein · Answer 1

X + y = 20 - - - > x = 20 - y

2.5x + 3.7y = (3.5) (20) = 70

--> 2.5 (20-y) + 3.7y = 70

--> 50 - 2.5y + 3.7y = 70

--> 1.2y = 20

---> y = 16.66

Answer: 16.66 gallons