Bryan R.

asked • 01/30/17

a medicine contains 25% alcohol. How much water should be added to 120cc of the medicine if the final mixture contains 20% alcohol?

a medicine contains 25% alcohol. How much water should be added to 120cc of the medicine if the final mixture contains 20% alcohol?

1 Expert Answer

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Mark M. answered • 01/30/17

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A 25% solution is 75% water.
A 20% solution is 80% water.
W represenst the amoun of water.
0.75(120) + W = 0.80(120 + W)
 
Can you solve for W?
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Bryan R.

30cc of water... This was a huge help, I have trouble finding the equation, solving it is easy enough once I find the equation, thank you
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01/30/17

Mark M.

You are welcome. Glad to hear that it was helpful.
Use the given equation as a template for future mixture problems.
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01/30/17

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