Target Test Prep's 2024 GMAT Focus Edition prep is discounted for the BTG community!

Redeem
Target Test Prep
5-Day Free Trial
5-day free, full-access trial TTP

Available with Beat the GMAT members only code

MORE DETAILS
Target Test Prep
Magoosh
Magoosh
Study with Magoosh GMAT prep

Available with Beat the GMAT members only code

MORE DETAILS
Magoosh

Pls help!!!

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 147
Joined: Tue Jun 14, 2011 7:03 am
Thanked: 3 times

Pls help!!!

by tracyyahoo » Mon Oct 03, 2011 1:03 am
The average (arithematic mean) of a list of numbers is what percent of the sum of the numbers?

(1) There are 8 numbers in the list
(2) The sum of the numbers in the list is 100

I Chose C, but unbelieveablly the answer is A, why the hell is that???? Pls explain me. Thank you
Top
Legendary Member
Posts: 966
Joined: Sat Jan 02, 2010 8:06 am
Thanked: 230 times
Followed by:21 members

by shankar.ashwin » Mon Oct 03, 2011 1:11 am
Average = Total / No. of Numbers

From (1) No of numbers = 8

Avg = Total / 8 (which is 12.5% of total)

Sufficient

From (2) Total is given, but we dont know No. of numbers.

Hence A
Top
Legendary Member
Posts: 2789
Joined: Tue Jul 26, 2011 12:19 am
Location: Chennai, India
Thanked: 206 times
Followed by:43 members
GMAT Score:640

by GmatKiss » Mon Oct 03, 2011 9:50 am
as simple as ashwin explained!

IMO:A
Top
User avatar
Master | Next Rank: 500 Posts
Posts: 312
Joined: Tue Aug 02, 2011 3:16 pm
Location: New York City
Thanked: 130 times
Followed by:33 members
GMAT Score:780

by gmatboost » Mon Oct 03, 2011 10:44 am
Perhaps re-arrange to emphasize the quantity we are looking for:
The average (arithematic mean) of a list of numbers is what percent of the sum of the numbers?
Average = x% * Sum
x% = Average/Sum

St 1: There are 8 numbers in the list.
Average = Sum/8 --> Divide by Sum
Average/Sum = 1/8 = x%
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.
Top
Post new topic Post Reply
• Page 1 of 1