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 →

what day was the appointment

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 91
Joined: Tue Mar 31, 2009 11:19 amFollowed by: 1 member
by BlueDragon2010 » Fri Jan 24, 2014 9:36 am
If Juan had a doctor's appointment on a certain day, was the appointment on a Wednesday?

1) Exactly 60 hours before the appointment, it was Monday.

2) The appointment was between 1:00 pm and 9:00 pm
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
User avatar
GMAT Instructor
Posts: 1052
Joined: Fri May 21, 2010 1:30 amFollowed by: 98 members
Thanked: 335 times

by Patrick_GMATFix » Fri Jan 24, 2014 9:46 am
The solution below is taken from the GMATFix App.

Image

-Patrick
  • Ask me about tutoring.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 2095
Joined: Tue Dec 04, 2012 3:22 pmFollowed by: 247 members
Thanked: 1443 times

by ceilidh.erickson » Fri Jan 24, 2014 3:42 pm
If Juan had a doctor's appointment on a certain day, was the appointment on a Wednesday?

There's not much we can do to rephrase the question stem, so all we can do is try to prove the statements INSUFFICIENT.

1) Exactly 60 hours before the appointment, it was Monday.

Monday at 12:00am + 60 hrs = 12:00pm on Wednesday
Monday at 11:59pm + 60 hrs = 11:59am on Thursday

Maybe the appointment is on Wednesday, but maybe it isn't. INSUFFICIENT.

2) The appointment was between 1:00 pm and 9:00 pm

This doesn't indicate what day the appointment was on. INSUFFICIENT.

Together:
If the appointment was between 1:00pm and 9:00pm, and 60 hrs before it was Monday, then the appointment has to be on Wednesday. As we've seen, Monday + 60 hrs only gives us a possible range of noon on Wednesday until 11:59am on Thursday. If the appointment was afternoon/evening, it had to be on Wednesday.

The answer is C.
Ceilidh Erickson
EdM in Mind, Brain, and Education
Harvard Graduate School of Education
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY

GMAT/MBA Expert

User avatar
Elite Legendary Member
Posts: 10392
Joined: Sun Jun 23, 2013 6:38 pmFollowed by: 511 members
Location: Palo Alto, CA
Thanked: 2867 times
GMAT Score:800

by [email protected] » Fri Jan 24, 2014 6:34 pm
Hi BlueDragon2010,

The other posts in this thread have properly explained the "math" behind this question, so I won't rehash that here. Instead, I'll offer some perspective on how DS questions are written. In many Quant questions, you'll be asked to solve for "one thing" (a variable, total, speed, probability, etc.); while many DS questions will ask you for a value, others will ask you a "yes/no" question. While the tactics for solving these types of questions is similar to other questions, your focus needs to be on the "consistency" of the results (and whether the results stay the same OR change). This question asks WAS the appointment on a Wednesday (a yes/no question)? MAYBE the appointment was on a Wednesday, MAYBE it wasn't. In these situations, make sure to be thorough with the possibilities and consider the options. Those considerations are the only way to be sure that you're answering the question correctly.

GMAT assassins aren't born, they're made,
Rich
Contact Rich at [email protected]
Image
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1