Shanice wants to make a 72% alcojol solution. She has already poured 2L of pure water into a beaker. How many L of a 90% alcohol solution must she add to this to create the desired mixture

Question

Mathematics

Jayden Walsh

6 January, 13:28

Shanice wants to make a 72% alcojol solution. She has already poured 2L of pure water into a beaker. How many L of a 90% alcohol solution must she add to this to create the desired mixture

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Answers (1)

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Quincy · Answer 1

8 L

Step-by-step explanation:

If x is the volume of 90% alcohol, then:

(0.90) (x) + (0) (2) = 0.72 (x + 2)

0.90x = 0.72x + 1.44

0.18x = 1.44

x = 8