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 →

Multiplication Problem

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 216
Joined: Mon Dec 21, 2009 10:26 am
Thanked: 16 times
by student22 » Fri Mar 12, 2010 12:56 pm
(0.025 * 15/2 * 48) / (5 * 0.0024 * 3/4) =

A. 0.1
B. 0.2
C. 100
D. 200
E. 1,000
E

Is there a number properties or logical reasoning way to quickly solve this problem? Otherwise, you'd have to be rain man to solve it in less than 2 minutes using straight multiplication. [/quote]
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
User avatar
Community Manager
Posts: 1537
Joined: Mon Aug 10, 2009 6:10 pmFollowed by: 252 members
Thanked: 653 times

by papgust » Fri Mar 12, 2010 6:26 pm
(25/1000 * 15/2 * 48) / (5 * 24/10000 * 3/4)

Take reciprocal of denominator,

25/1000 * 15/2 * 48 * 1/5 * 10000/24 * 4/3

Cancelling, you get

25 * 4 * 10 = [spoiler]1000 (E)[/spoiler]
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
GMAT Instructor
Posts: 3225
Joined: Tue Jan 08, 2008 2:40 pmFollowed by: 614 members
Location: Toronto
Thanked: 1710 times
GMAT Score:800

by Stuart@KaplanGMAT » Fri Mar 12, 2010 11:46 pm
When the answer choices are so spread out, we can also estimate to find the right answer:

(0.025 * 15/2 * 48) / (5 * 0.0024 * 3/4)

let's rearrange it to:

0.025/0.0024 * (15/2)/5 * 48/(3/4)

estimating, we have:

more than 10 * more than 1 * more than 48 = more than 480... choose E.
Image

Stuart Kovinsky | Kaplan GMAT Faculty | Toronto

Kaplan Exclusive: The Official Test Day Experience | Ready to Take a Free Practice Test? | Kaplan/Beat the GMAT Member Discount
BTG100 for $100 off a full course
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 232
Joined: Sun Feb 28, 2010 10:47 pm
Thanked: 10 times

by Phirozz » Sat Mar 13, 2010 12:08 am
student22 wrote:
(0.025 * 15/2 * 48) / (5 * 0.0024 * 3/4) =

A. 0.1
B. 0.2
C. 100
D. 200
E. 1,000
E

Is there a number properties or logical reasoning way to quickly solve this problem? Otherwise, you'd have to be rain man to solve it in less than 2 minutes using straight multiplication.
[/quote]

Cancal 15/2 from both numarator and denomator. Now we are geting (0.025*48)/0.0012. Now 0.0025/0.0012 is definitely more than 20 so result is more than 20*48 ie 960. Answer is E
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 216
Joined: Mon Dec 21, 2009 10:26 am
Thanked: 16 times

by student22 » Sat Mar 13, 2010 12:53 pm
Just had a chance to get back to this topic. Thanks guys, this is exactly what I was looking for, since the GMAT wouldn't put a question that you had to spend 3 minutes on to solve.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1