• NEW! FREE Beat The GMAT Quizzes
Hundreds of Questions Highly Detailed Reporting Expert Explanations
• 7 CATs FREE!
If you earn 100 Forum Points

Engage in the Beat The GMAT forums to earn
100 points for $49 worth of Veritas practice GMATs FREE VERITAS PRACTICE GMAT EXAMS Earn 10 Points Per Post Earn 10 Points Per Thanks Earn 10 Points Per Upvote A certain zoo has 288 mammals, 25 percent of which are tagged by: swerve This topic has 2 member replies Top Member A certain zoo has 288 mammals, 25 percent of which are Timer 00:00 Your Answer A B C D E Global Stats Difficult Source: Veritas Prep A certain zoo has 288 mammals, 25 percent of which are female. What percent of the mammals in the zoo were born at the zoo? (1) The number of male mammals that were born at the zoo is three times the number of female mammals who were not born at the zoo. (2) The number of male mammals that were not born at the zoo is three times the number of male mammals that were born at the zoo. OA C. Top Member Legendary Member Joined 02 Mar 2018 Posted: 786 messages Followed by: 1 members .. Last edited by deloitte247 on Sat Aug 18, 2018 11:57 am; edited 1 time in total Top Member Legendary Member Joined 02 Mar 2018 Posted: 786 messages Followed by: 1 members Male (born at zoo) + Male (not born at zoo) = 75% of 288 = 216 Female (born at zoo) + Female (not born at zoo) = 25% of 288 = 72 Question : What % of the mammal were born at zoo? Statement 1 : The number of male mammals that were born at zoo is 3 times the number of female mammals that were not born at zoo. Therefore, Male (born at zoo) = 3x female (not born at zoo) The information here is not enough to determine the % of mammals born at zoo. Hence, statement 1 is NOT SUFFICIENT. Statement 2 : The number of male mammals that weren't born at zoo is 3 times the number of male mammals that were born at zoo. This means it's in ratio 3 : 1 $$Male\left(born\ at\ zoo\right)\ =\ \frac{216}{3\ +\ 1}\ =\ \frac{216}{4}\ =\ 54$$ but there i no information about the female, hence, statement 2 is INSUFFICIENT. Statement 1 and 2 together Male (born at zoo) = 3 * female (not born in zoo) Male (born at zoo) = 54 $$\frac{54}{3}=\ \frac{\left(3\ \cdot\ female\ \left(not\ born\ at\ zoo\right)\right)}{3}$$ Female (not born at zoo) = Total no. of females (not born in zoo) = 72 - 18 = 54 Mammals (born at zoo) = Male (born at zoo) + Female(born at zoo) Mammals (born at zoo) = 54 + 54 = 108. $$\%\ of\ mammals\ born\ at\ zoo\ =\ \frac{108}{288}\cdot\ \frac{100}{1}$$ = 37.5% Statement 1 and 2 combined together is SUFFICIENT. Option C is CORRECT. • Award-winning private GMAT tutoring Register now and save up to$200

Available with Beat the GMAT members only code

• Get 300+ Practice Questions

Available with Beat the GMAT members only code

• Free Practice Test & Review
How would you score if you took the GMAT

Available with Beat the GMAT members only code

• Free Trial & Practice Exam
BEAT THE GMAT EXCLUSIVE

Available with Beat the GMAT members only code

• 5 Day FREE Trial
Study Smarter, Not Harder

Available with Beat the GMAT members only code

• 5-Day Free Trial
5-day free, full-access trial TTP Quant

Available with Beat the GMAT members only code

• Free Veritas GMAT Class
Experience Lesson 1 Live Free

Available with Beat the GMAT members only code

• 1 Hour Free
BEAT THE GMAT EXCLUSIVE

Available with Beat the GMAT members only code

• FREE GMAT Exam
Know how you'd score today for \$0

Available with Beat the GMAT members only code

• Magoosh
Study with Magoosh GMAT prep

Available with Beat the GMAT members only code

Top First Responders*

1 Jay@ManhattanReview 67 first replies
2 Brent@GMATPrepNow 53 first replies
3 fskilnik@GMATH 49 first replies
4 GMATGuruNY 32 first replies
5 Rich.C@EMPOWERgma... 29 first replies
* Only counts replies to topics started in last 30 days
See More Top Beat The GMAT Members

Most Active Experts

1 fskilnik@GMATH

GMATH Teacher

107 posts
2 Brent@GMATPrepNow

GMAT Prep Now Teacher

99 posts
3 Max@Math Revolution

Math Revolution

90 posts
4 Jay@ManhattanReview

Manhattan Review

78 posts
5 GMATGuruNY

The Princeton Review Teacher

77 posts
See More Top Beat The GMAT Experts