GRE Prep Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
A brown flask contains a concoction that is 20% alcohol.
[#permalink]
26 Jun 2020, 00:55
26 Jun 2020, 00:55
1
7
Bookmarks
00:00
Question Stats:
56% (02:33) correct
43% (03:05) wrong based on 57 sessions
Hide Show timer Statistics
A brown flask contains a concoction that is 20% alcohol. A red flask contains a concoction with an unknown amount of alcohol. An equal amount of both flasks is poured into an empty jug. If the resulting mixture has an alcohol concentration that is 30% greater than the alcohol concentration of the brown flask, what percent alcohol did the red flask originally contain?
(A) 23%
(B) 25%
(C) 32%
(D) 33%
(E) 40%
(A) 23%
(B) 25%
(C) 32%
(D) 33%
(E) 40%
Re: A brown flask contains a concoction that is 20% alcohol.
[#permalink]
26 Jun 2020, 06:22
26 Jun 2020, 06:22
5
The brown flask contains 20% alcohol, the final mixture has an alcohol content thats 30% greater than the brown flask concentration.
20 * 1.30 = 26% - final alcohol concentration (30% greater than starting 20%)
Now basically if we combine 2 alcoholic mixtures in the equal amounts the resulting mixture will have the alcohol content of the average between the two percentages. (ex. if the two jugs have 20% and 22%, the combined mixture will be 21%)
To get 26% final concentration we must then have 32% alcohol in the red flask ([20+32]/2 = 26%)
So the answer is C
20 * 1.30 = 26% - final alcohol concentration (30% greater than starting 20%)
Now basically if we combine 2 alcoholic mixtures in the equal amounts the resulting mixture will have the alcohol content of the average between the two percentages. (ex. if the two jugs have 20% and 22%, the combined mixture will be 21%)
To get 26% final concentration we must then have 32% alcohol in the red flask ([20+32]/2 = 26%)
So the answer is C
General Discussion
Re: A brown flask contains a concoction that is 20% alcohol.
[#permalink]
07 Jul 2020, 06:11
07 Jul 2020, 06:11
2
30% of 20 is 6
so 20 + 6 = 26 which is the resultant mixture or our target to achieve.
Both mixture are added in equal quantity so we can take avg
(20+x)/2=26
x=32
Though I would like to know that how can we apply allegation method here?
so 20 + 6 = 26 which is the resultant mixture or our target to achieve.
Both mixture are added in equal quantity so we can take avg
(20+x)/2=26
x=32
Though I would like to know that how can we apply allegation method here?
