GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 22 Feb 2019, 11:04

### GMAT 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

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

## Events & Promotions

###### Events & Promotions in February
PrevNext
SuMoTuWeThFrSa
272829303112
3456789
10111213141516
17181920212223
242526272812
Open Detailed Calendar
• ### Free GMAT RC Webinar

February 23, 2019

February 23, 2019

07:00 AM PST

09:00 AM PST

Learn reading strategies that can help even non-voracious reader to master GMAT RC. Saturday, February 23rd at 7 AM PT
• ### FREE Quant Workshop by e-GMAT!

February 24, 2019

February 24, 2019

07:00 AM PST

09:00 AM PST

Get personalized insights on how to achieve your Target Quant Score.

# A drum of bathroom cleaner contains 200 gallons of a cleaning solution

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 53066
A drum of bathroom cleaner contains 200 gallons of a cleaning solution  [#permalink]

### Show Tags

10 Aug 2017, 23:16
00:00

Difficulty:

5% (low)

Question Stats:

86% (01:27) correct 14% (01:39) wrong based on 137 sessions

### HideShow timer Statistics

A drum of bathroom cleaner contains 200 gallons of a cleaning solution that is 20% bleach. If 50 gallons of water are added to the solution, what percent of the new solution is composed of bleach?

A. 12%
B. 15%
C. 16%
D. 18%
E. 20%

_________________
Director
Joined: 04 Dec 2015
Posts: 740
Location: India
Concentration: Technology, Strategy
Schools: ISB '19, IIMA , IIMB, XLRI
WE: Information Technology (Consulting)
Re: A drum of bathroom cleaner contains 200 gallons of a cleaning solution  [#permalink]

### Show Tags

10 Aug 2017, 23:33
2
Bunuel wrote:
A drum of bathroom cleaner contains 200 gallons of a cleaning solution that is 20% bleach. If 50 gallons of water are added to the solution, what percent of the new solution is composed of bleach?

A. 12%
B. 15%
C. 16%
D. 18%
E. 20%

Cleaning solution $$= 200$$ gallons

$$20$$% of cleaning solution is bleach $$= 20$$% of $$200 = \frac{20}{100} * 200 = 40$$ gallons

$$50$$ gallons of water is added to solution.

Therefore new total gallons of Cleaning solution $$= 200 + 50 = 250$$ gallons

Required Percentage $$=$$ (Bleach $$/$$ New solution )$$* 100$$

Required Percentage $$= ( \frac{40}{250} ) * 100 = \frac{4000}{250} = 16$$%

Senior PS Moderator
Joined: 26 Feb 2016
Posts: 3343
Location: India
GPA: 3.12
Re: A drum of bathroom cleaner contains 200 gallons of a cleaning solution  [#permalink]

### Show Tags

10 Aug 2017, 23:34
If 20% of the cleaning solution(200 gallons) is bleach,
the bleach is 40 gallons and water is 160 gallons.

Since 50 gallons of water is added to this solution,
the new percentage of bleach in the solution is $$\frac{40}{250} = \frac{40}{250}*100 = \frac{40*2}{5} = \frac{80}{5}= 16%$$(Option C)
_________________

You've got what it takes, but it will take everything you've got

Senior SC Moderator
Joined: 22 May 2016
Posts: 2492
A drum of bathroom cleaner contains 200 gallons of a cleaning solution  [#permalink]

### Show Tags

11 Aug 2017, 05:22
2
Bunuel wrote:
A drum of bathroom cleaner contains 200 gallons of a cleaning solution that is 20% bleach. If 50 gallons of water are added to the solution, what percent of the new solution is composed of bleach?

A. 12%
B. 15%
C. 16%
D. 18%
E. 20%

Let x = Resultant percentage of bleach
Water is 0.0 percent bleach

(.20)200 + (0.0)(50) = $$\frac{x}{100}$$(200 + 50)

40 = $$\frac{x}{100}$$ (250)

40 = $$\frac{250}{100}$$x, or $$\frac{5}{2}$$x

$$\frac{2}{5}$$*(40) = x

x = 16

_________________

To live is the rarest thing in the world.
Most people just exist.

Oscar Wilde

VP
Joined: 07 Dec 2014
Posts: 1154
A drum of bathroom cleaner contains 200 gallons of a cleaning solution  [#permalink]

### Show Tags

11 Aug 2017, 08:50
Bunuel wrote:
A drum of bathroom cleaner contains 200 gallons of a cleaning solution that is 20% bleach. If 50 gallons of water are added to the solution, what percent of the new solution is composed of bleach?

A. 12%
B. 15%
C. 16%
D. 18%
E. 20%

let x=% bleach in new solution
.2*200=x*250
x=16%
C
Intern
Joined: 06 Nov 2016
Posts: 27
Re: A drum of bathroom cleaner contains 200 gallons of a cleaning solution  [#permalink]

### Show Tags

14 Aug 2017, 17:07
Based on the question, we realize the value will be closer to 20 than to 10.

200 at 20% 50G at 0%
A-----------C------------------------------------B

The gallons mixed are in the ratio of 4:1 since 200 G are mixed with 50 G. Hence 4 parts of bleach will be mixed with one part of water. Hence 16%.
Non-Human User
Joined: 09 Sep 2013
Posts: 9896
Re: A drum of bathroom cleaner contains 200 gallons of a cleaning solution  [#permalink]

### Show Tags

13 Oct 2018, 06:54
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: A drum of bathroom cleaner contains 200 gallons of a cleaning solution   [#permalink] 13 Oct 2018, 06:54
Display posts from previous: Sort by