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A 400 milliliter solution is 20% alcohol by volume. If 100 m
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08 Apr 2020, 05:24
08 Apr 2020, 05:24
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A 400-milliliter solution is 20% alcohol by volume. If 100 milliliters of water is added, what is the new concentration of alcohol, as a percent of volume?
(A) 5%
(B) 10%
(C) 12%
(D) 12.5%
(E) 16%
Kudos for the right answer and explanation
(A) 5%
(B) 10%
(C) 12%
(D) 12.5%
(E) 16%
Kudos for the right answer and explanation
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
Re: A 400 milliliter solution is 20% alcohol by volume. If 100 m
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08 Apr 2020, 06:31
08 Apr 2020, 06:31
Carcass wrote:
A 400-milliliter solution is 20% alcohol by volume. If 100 milliliters of water is added, what is the new concentration of alcohol, as a percent of volume?
(A) 5%
(B) 10%
(C) 12%
(D) 12.5%
(E) 16%
Kudos for the right answer and explanation
(A) 5%
(B) 10%
(C) 12%
(D) 12.5%
(E) 16%
Kudos for the right answer and explanation
A 400 milliliter solution is 20% alcohol by volume.
20% of 400 = 80
So, the original solution contains 80 milliliters of alcohol
If 100 milliliters of water is added...
400 + 100 = 500
So, our NEW solution has a total volume of 500 milliliters
...what is the new concentration of alcohol, as a percent of volume?
NEW concentration of alcohol = 80/500
Divide top and bottom of our fraction by 5 to get: 16/100, which is the same as 16%
Answer: E
Cheers,
Brent
Re: A 400 milliliter solution is 20% alcohol by volume. If 100 m
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03 May 2020, 17:28
03 May 2020, 17:28
16%
