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

 It is currently 18 Jan 2019, 04:24

### 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 January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar
• ### Free GMAT Strategy Webinar

January 19, 2019

January 19, 2019

07:00 AM PST

09:00 AM PST

Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT.
• ### FREE Quant Workshop by e-GMAT!

January 20, 2019

January 20, 2019

07:00 AM PST

07:00 AM PST

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

# The average age of children on a certain playground is 3.7 years. The

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

### Hide Tags

Intern
Joined: 07 Jun 2018
Posts: 42
The average age of children on a certain playground is 3.7 years. The  [#permalink]

### Show Tags

13 Jan 2019, 14:25
00:00

Difficulty:

35% (medium)

Question Stats:

77% (00:42) correct 23% (01:41) wrong based on 26 sessions

### HideShow timer Statistics

The average age of children on a certain playground is 3.7 years. The average age of girls is 3.3 years. What is the average age of boys?

1. The ratio of boys to girls is 3:2

2. There are 10 girls
RC Moderator
Joined: 24 Aug 2016
Posts: 635
Concentration: Entrepreneurship, Operations
GMAT 1: 630 Q48 V28
GMAT 2: 540 Q49 V16
Re: The average age of children on a certain playground is 3.7 years. The  [#permalink]

### Show Tags

13 Jan 2019, 17:03
1. Sufficient
If there are 3 boys and 2 girls, Aveg age of boys = (3.7*5 -3.3*2)/3 can be determined
or If there are 6 boys and 4 girls, Aveg age of boys = (3.7*10 -3.3*4)/6 can be determined
2. Not Sufficient - No information about the boys

Hence Answer would be A.
_________________

Please let me know if I am going in wrong direction.
Thanks in appreciation.

GMAT Tutor
Joined: 07 Nov 2016
Posts: 45
GMAT 1: 760 Q51 V42
Re: The average age of children on a certain playground is 3.7 years. The  [#permalink]

### Show Tags

13 Jan 2019, 20:41
Jazzmin wrote:
The average age of children on a certain playground is 3.7 years. The average age of girls is 3.3 years. What is the average age of boys?

1. The ratio of boys to girls is 3:2

2. There are 10 girls

By the Rule of Alligations

$$\frac{b}{g}$$ = $$\frac{(A - A_g)}{(A_b- A)}$$

$$\frac{b}{g}$$ = $$\frac{(3.7- 3.3)}{A_b - 3.7)}$$ ..... Eqn 1

St 1 : b/g = 3/2, Substituting in Eqn 1

We are left with one unknown ( $$A_b$$ ) and one Equation

Sufficient

St 2 : g = 10, Substituting this in Eqn 1 we are left with two unknowns and one Equation

Not Sufficient

Choice A
_________________

Re: The average age of children on a certain playground is 3.7 years. The &nbs [#permalink] 13 Jan 2019, 20:41
Display posts from previous: Sort by

# The average age of children on a certain playground is 3.7 years. The

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

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.