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

Redeem

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.

★★★★★5.0559 reviews
GMATLiveTeach 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
Live EA class + 6 months of EA OnDemand
  • Expert-led weekly online sessions
  • EA Masterclass access between classes
View EA class & enroll
Limited cohort · enrollment openTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

130-point score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

overlapping set

Expert replies
by 2010gmat » Sun Nov 08, 2009 6:32 am
are the two questions asking for the same thing or is there a subtle diff??

80% of the lights in a hotel were on at 8.00 pm on some evening. If 40% of lights that were expected to be off, were in fact on, and 10% of lights that were expected to be on, were in fact off; what percent of the lights that are on, are the lights that were not expected to be on? A. 10
B. 12
C. 100/9
D. 8
E. 18

Eighty percent of the lights at Hotel California are switched on at 8 p.m. one evening. However, forty percent of the lights that are supposed to be switched off are actually switched on, and ten percent of the lights that are supposed to be switched on are actually switched off. What percent of the lights that are switched on are supposed to be switched off?

22(2/9)%
16(2/3)%
11(1/9)%
10%
5%
Join the discussion
Source: — Problem Solving |

by palvarez » Sun Nov 08, 2009 7:51 am
No difference, same thing.

of the lights that are [switched] on
lights that were not expected to be on = lights that were supposed to be off
Join the discussion

by 2010gmat » Sun Nov 08, 2009 8:11 am
got it...but took some time to decipher the question... :D
Join the discussion

by vivek.kapoor83 » Mon Nov 09, 2009 4:40 am
pls post the OA for the ques.also with solution
Join the discussion

by 2010gmat » Mon Nov 09, 2009 4:50 am
OA is D for both ques ....
Join the discussion

by vivek.kapoor83 » Mon Nov 09, 2009 11:04 am
can u provide the solution also?
Join the discussion