GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 17 Oct 2019, 03:53 GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.  If the average (arithmetic mean) of 6 numbers is 30, what is the avera

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

Hide Tags

Math Expert V
Joined: 02 Sep 2009
Posts: 58428
If the average (arithmetic mean) of 6 numbers is 30, what is the avera  [#permalink]

Show Tags 00:00

Difficulty:   25% (medium)

Question Stats: 76% (01:20) correct 24% (01:24) wrong based on 28 sessions

HideShow timer Statistics

If the average (arithmetic mean) of 6 numbers is 30, what is the average of all the numbers that are less than 30?

(1) Two of the numbers are 30 or greater.
(2) The average of the numbers that are greater than or equal to 30 is 48.

_________________
examPAL Representative P
Joined: 07 Dec 2017
Posts: 1140
Re: If the average (arithmetic mean) of 6 numbers is 30, what is the avera  [#permalink]

Show Tags

Bunuel wrote:
If the average (arithmetic mean) of 6 numbers is 30, what is the average of all the numbers that are less than 30?

(1) Two of the numbers are 30 or greater.
(2) The average of the numbers that are greater than or equal to 30 is 48.

To calculate the average we need the sum and the number of items.
We'll look for statements that give the required information, a Logical approach.

(1) To calculate the average of the two numbers we need their sum!
Insufficient.

(2) This time we're given their average but not the amount of numbers!
Insufficient.

Combined:
Now we know how many numbers are greater or equal to 30 and their average so can calculate their sum.
That means we know the sum of the rest of the numbers and can calculate their average.
Sufficient!

(C) is our answer.
_________________ Re: If the average (arithmetic mean) of 6 numbers is 30, what is the avera   [#permalink] 01 Jan 2018, 02:39
Display posts from previous: Sort by

If the average (arithmetic mean) of 6 numbers is 30, what is the avera

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne  