BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

another data sufficiency question

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 44
Joined: Wed Nov 03, 2010 10:07 am
Thanked: 1 times
by nickhar130 » Fri Jan 07, 2011 3:46 pm
At a certain pet shop, 1/3 of pets are dogs & 1/5 of pets are birds. How many of the pets are dogs?

1) There are 30 birds at the pet shop
2) there are 20 more dogs then birds at the pet shop.

How do i solve with the 2nd information given by itself. Please explain.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
User avatar
Legendary Member
Posts: 543
Joined: Tue Jun 15, 2010 7:01 pmFollowed by: 3 members
Thanked: 147 times

by anshumishra » Fri Jan 07, 2011 4:00 pm
nickhar130 wrote:At a certain pet shop, 1/3 of pets are dogs & 1/5 of pets are birds. How many of the pets are dogs?

1) There are 30 birds at the pet shop
2) there are 20 more dogs then birds at the pet shop.

How do i solve with the 2nd information given by itself. Please explain.
Let there are a total of x pets.
x/3 -> dogs = ?
x/5 -> birds
So, if we know x, we can calculate x/3, so question stem is , x = ?

Statement 1:
x/5 = 30 - Sufficient
(=> x = 150 --- You don't need to calculate it, as long as you know you can find it.)

Statement 2:
x/3 - x/5 = 20 [STOP, RIGHT HERE...YOU DONT NEED TO CALCULATE X. YOU HAVE AN EQUATION FOR X IN ONE DEGREE, SO IT IS SUFFICIENT]
I AM SHOWING IT HERE, AS THAT WAS YOUR QUESTION
=> (5x-3x)/15 = 200
=> x = 15*200/2 = 150

Hence, D
Thanks
Anshu

(Every mistake is a lesson learned )
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1