Summer is Coming! Join the Game of Timers Competition to Win Epic Prizes. Registration is Open. Game starts Mon July 1st.

 It is currently 17 Jul 2019, 23:57

### 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
Your Progress

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

# In a certain boys camp, 20% of the total boys are from

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

### Hide Tags

Intern
Joined: 29 Jan 2014
Posts: 17
GMAT 1: 510 Q36 V26
GMAT 2: 550 Q38 V28
In a certain boys camp, 20% of the total boys are from  [#permalink]

### Show Tags

19 Aug 2014, 06:41
1
3
00:00

Difficulty:

15% (low)

Question Stats:

80% (02:04) correct 20% (02:15) wrong based on 98 sessions

### HideShow timer Statistics

In a certain boys camp, 20% of the total boys are from school A and 30% of those study science. If there are 49 boys in the camp that are from school A but do not study science then what is the total number of boys in the camp?

A. 70
B. 245
C. 150
D. 35
E. 350

_________________
Please give me Kudos if you like my post. Thank you
Math Expert
Joined: 02 Sep 2009
Posts: 56272
Re: In a certain boys camp, 20% of the total boys are from  [#permalink]

### Show Tags

19 Aug 2014, 07:28
benjamin09 wrote:
In a certain boys camp, 20% of the total boys are from school A and 30% of those study science. If there are 49 boys in the camp that are from school A but do not study science then what is the total number of boys in the camp?

A. 70
B. 245
C. 150
D. 35
E. 350

Since 30% of the boys from school A study science, then 70% of the boys from school A do NOT study science and since 20% of the total number of boys are from school A, then 0.2*0.7 = 0.14, or 14% of the boys in the camp are from school A and do not study science.

We are told that this number equals to 49, so 0.14*{total} = 49 --> {total} = 350.

Answer: E.
_________________
SVP
Status: The Best Or Nothing
Joined: 27 Dec 2012
Posts: 1787
Location: India
Concentration: General Management, Technology
WE: Information Technology (Computer Software)
Re: In a certain boys camp, 20% of the total boys are from  [#permalink]

### Show Tags

19 Aug 2014, 23:08
2
Refer diagram below
Attachment:

scie.png [ 4.76 KiB | Viewed 4106 times ]

Lets say total number of students = x

From School A$$= \frac{20x}{100}$$

30% from School A study science$$= \frac{20x}{100} * \frac{30}{100} = \frac{6x}{100}$$

Remaining from School A not studying science$$= \frac{20x}{100} - \frac{6x}{100} = \frac{14x}{100}$$

Given that $$\frac{14x}{100} = 49$$

x = 350

Answer = E
_________________
Kindly press "+1 Kudos" to appreciate
Intern
Joined: 29 Jan 2014
Posts: 17
GMAT 1: 510 Q36 V26
GMAT 2: 550 Q38 V28
Re: In a certain boys camp, 20% of the total boys are from  [#permalink]

### Show Tags

19 Aug 2014, 23:12
Thanks a lot Bunuel & Paresh.
_________________
Please give me Kudos if you like my post. Thank you
Manager
Joined: 18 Oct 2018
Posts: 83
Location: India
Concentration: Finance, International Business
GPA: 4
WE: Business Development (Retail Banking)
Re: In a certain boys camp, 20% of the total boys are from  [#permalink]

### Show Tags

11 Jan 2019, 11:33
Let the total boys in camp=100
Boys from School A=20*100/100=20
Boys from school A which study science= 3*20/100=6
Boys from school A which do not study Science=20-6=14

Now, by unitary method,
No. of boys in camp=100*49/14=350
Re: In a certain boys camp, 20% of the total boys are from   [#permalink] 11 Jan 2019, 11:33
Display posts from previous: Sort by

# In a certain boys camp, 20% of the total boys are from

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne