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 Starts Oct 17
Chris Peckover, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Chris Peckover, 100th-Percentile GMAT Scorer

Oct 17 · Chris Peckover
Sat · 11:00 AM to 2:00 PM ET
Oct 20 · Chris Peckover
Tue, Thu · 8:00 to 10:00 PM ET
Oct 25 · Josh Braslow
Sun · 1:00 to 4:00 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
EALiveTeachOnDemand 5 seats left Start anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Sun · 9:30 AM to 12:30 PM ET
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
GMATOnDemand Start 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

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

Elementary Grades

Expert replies
by edvhou812 » Wed Sep 14, 2011 9:00 pm
Manhattan GMAT practice test question. I got the correct answer during test review, but it took me five minutes. Can an expert or top poster help me with a quick way to the answer? Thanks.


At Jefferson Elementary School, the number of teachers and students (kindergarten through sixth grade) totals 510. The ratio of students to teachers is 16 to 1. Kindergarten students make up 1/5 of the student population and fifth and sixth graders account for 1/3 of the remainder. Students in first and second grades account for 1/4 of all the students. If there are an equal number of students in the third and fourth grades, then the number of students in third grade is how many greater or fewer than the number of students in kindergarten?

12 greater
17 fewer
28 fewer
36 fewer
44 fewer
I don't know what to say, really. Three minutes to the biggest battle of our professional lives. You find out life's this game of inches, so is football. Because in either game - life or football - the margin for error is so small. I mean, one half a step too late or too early and you don't quite make it. One half second too slow, too fast and you don't quite catch it. I'll tell you this, in any fight it's the guy whose willing to die whose gonna win that inch. That's football guys, that's all it is. Now, what are you gonna do?
Join the discussion
Source: — Problem Solving |

by cans » Wed Sep 14, 2011 9:07 pm
ratio:16:1 ,total=510. thus 30 teachers and 480 students.
kindergarten-> 1/5 = 96 and remainder=4/5
5+6 -> (1/3)(4/5)=4/15
1+2 -> 1/4
let 3=4=x.
(1/5 + 1/4 + 4/15) 480 + 2x = 480 -> 2x = 480*17/60 -> x = 68.
Thus 96-68 = 28 fewer
If my post helped you- let me know by pushing the thanks button ;)

Contact me about long distance tutoring!
[email protected]

Cans!!
Join the discussion

by gmatboost » Thu Sep 15, 2011 7:03 am
A few tips on how to do the required calculations faster, if you decided to calculate the numbers in each grade or set of grades:

1/5 of 480
Instead of multiplying by 1/5 (dividing by 5) you should always multiply by 2/10, because it is much faster. 480/10 = 48. 48 * 2 = 96.
See more: https://blog.gmatboost.com/2011/08/02/mu ... e-quickly/

480 - 96
Instead of subtracting 96, subtract 100 and add back 4: 480 - 100 = 380. 380 + 4 = 384.

1/3 of 384:
Split 384 into 300 + 60 + 24
Take 1/3 of each: 100 + 20 + 8 = 128

1/4 of 480 = 120 should be no problem

Now to get 3rd + 4th
480 - 120 = 360
360 - 96 = 360 - 100 + 4 = 264
264 - 128 = 264 - 130 + 2 = 134 + 2 = 136.
3rd grade = 136/2 = (120 + 16)/2 = 60 + 8 = 68

96 - 68 = 96 - 70 + 2 = 26 + 2 = 28
Greg Michnikov, Founder of GMAT Boost

GMAT Boost offers 250+ challenging GMAT Math practice questions, each with a thorough video explanation, and 100+ GMAT Math video tips, each 90 seconds or less.
It's a total of 20+ hours of expert instruction for an introductory price of just $10.
View sample questions and tips without signing up, or sign up now for full access.


Also, check out the most useful GMAT Math blog on the internet here.
Join the discussion