Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 563 reviewsTarget Test Prep

A ten headed demon

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
User avatar
GMAT Instructor
Posts: 3650
Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members
Location: India
Thanked: 267 times
GMAT Score:760
by sanju09 » Sun Oct 20, 2013 5:18 am
A ten headed demon has its sixth head 40 percent heavier than its second head, counting left to right. His each head from second to fifth is x pounds heavier than the previous one, and his each head from sixth to tenth is x pounds lighter than the previous one. If his first head weighs 4 pounds, then what is the value of x?
A. ½
B. 1
C. 1½
D. 2
E. 2½



Made up
The mind is everything. What you think you become. –Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
Top
Join the discussion
Source: — Problem Solving |
User avatar
Legendary Member
Posts: 1555
Joined: Tue Aug 14, 2012 11:18 pmFollowed by: 34 members
Thanked: 448 times
GMAT Score:650

by theCodeToGMAT » Sun Oct 20, 2013 5:31 am
L TO R : 6th Head = 1.4 (2nd)

1st = H
2nd = H + x
3rd = H + 2x
4th = H + 3x
5th = H + 4x
6th = H + 3x
7th = H + 2x
8th = H + x
9th = H
10th= H - x

H = 4

H + 3x = 1.4 (H + x)
4 + 3x = 1.4*4 + 1.4X

1.6x = 1.6
x = 1

is it {B}?

btw, belated Happy Dussehra :)
R A H U L
Top
Join the discussion
Master | Next Rank: 500 Posts
Posts: 269
Joined: Thu Sep 19, 2013 12:46 amFollowed by: 7 members
Thanked: 94 times

by mevicks » Sun Oct 20, 2013 6:24 am
Original situation: 4_ a_ __ __ __ 1.4a __ __ __ __

Directly test the answer values, starting with C:

x = 1.5
Add 1.5 from 2nd to fifth, Inclusive. Reduce 1.5 from 6th onwards...
4_ 6.5 8_ 9.5 11 9.5 __ __ __ __
But 6.5*1.4 = 9.1 ≠ 9.5
Since the answer is greater test the next lower value

x = 1
Add 1 from 2nd to fifth, Inclusive. Reduce 1 from 6th onwards...
4_ 5_ 6_ 7_ 8_ 7_ __ __ __ __
5*1.4 = 7

Thus the answer seems to be B
Top
Join the discussion
User avatar
Master | Next Rank: 500 Posts
Posts: 283
Joined: Sun Jun 23, 2013 11:56 pmFollowed by: 26 members
Location: Bangalore, India
Thanked: 97 times
GMAT Score:750

by ganeshrkamath » Sun Oct 20, 2013 6:53 am
sanju09 wrote:A ten headed demon has its sixth head 40 percent heavier than its second head, counting left to right. His each head from second to fifth is x pounds heavier than the previous one, and his each head from sixth to tenth is x pounds lighter than the previous one. If his first head weighs 4 pounds, then what is the value of x?
A. ½
B. 1
C. 1½
D. 2
E. 2½



Made up
W6 = 1.4W2
W6 = W5 - x
= (W4 + x) - x
= (W3 + 2x) - x
= (W2 + 3x) - x
= W2 + 2x

1.4W2 = W2 + 2x
0.4W2 = 2x
x = 0.2W2
x = 0.2(W1 + x)
x = 0.2W1 + 0.2x
0.8x = 0.2W1
x = W1/4 = 4/4 = 1

Choose B

Cheers
Every job is a self-portrait of the person who did it. Autograph your work with excellence.

Kelley School of Business (Class of 2016)
GMAT Score: 750 V40 Q51 AWA 5 IR 8
https://www.beatthegmat.com/first-attemp ... tml#688494
Top
Join the discussion
User avatar
GMAT Instructor
Posts: 3650
Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members
Location: India
Thanked: 267 times
GMAT Score:760

by sanju09 » Mon Oct 21, 2013 11:06 pm
theCodeToGMAT wrote:L TO R : 6th Head = 1.4 (2nd)

1st = H
2nd = H + x
3rd = H + 2x
4th = H + 3x
5th = H + 4x
6th = H + 3x
7th = H + 2x
8th = H + x
9th = H
10th= H - x

H = 4

H + 3x = 1.4 (H + x)
4 + 3x = 1.4*4 + 1.4X

1.6x = 1.6
x = 1

is it {B}?

btw, belated Happy Dussehra :)
Yes, it's (B)! Plugging in the answers would have been a far faster approach for this kind of a question; as adopted by mevicks.

[spoiler]Same to you for the greetings, Rahul![/spoiler]
The mind is everything. What you think you become. –Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
Top
Join the discussion