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

Redeem

Average problem

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 298
Joined: Tue Feb 16, 2010 1:09 am
Thanked: 2 times
Followed by:1 members

Average problem

by Deepthi Subbu » Fri Jan 07, 2011 2:26 am
The average of four numbers 12,y,39,76 is what percent of the sum of four numbers?

a. 12%
b. 20%
c . 25%
d . 32%
e . It cannot be determined from the information given.
Top
Source: — Problem Solving |
Senior | Next Rank: 100 Posts
Posts: 95
Joined: Wed Sep 22, 2010 8:26 am
Thanked: 1 times
Followed by:1 members

by RACHVIK » Fri Jan 07, 2011 2:45 am
Avg of 4 Numbers is always 1/4th the sum of numbers. Hence answer is C

Thanks
Rachvik
Top
User avatar
Community Manager
Posts: 991
Joined: Thu Sep 23, 2010 6:19 am
Location: Bangalore, India
Thanked: 146 times
Followed by:24 members

by shovan85 » Fri Jan 07, 2011 2:53 am
Deepthi Subbu wrote:The average of four numbers 12,y,39,76 is what percent of the sum of four numbers?

a. 12%
b. 20%
c . 25%
d . 32%
e . It cannot be determined from the information given.
Ideally it should be 25% but what about when the sum comes to zero. Say y = -127 then Sum = 0 and Average = 0. In this case the percentage is undefined.

So IMO E
If the problem is Easy Respect it, if the problem is tough Attack it
Top
User avatar
Legendary Member
Posts: 1077
Joined: Mon Dec 13, 2010 1:44 am
Thanked: 118 times
Followed by:33 members
GMAT Score:710

by bblast » Fri Jan 07, 2011 3:29 am
methodical solution :
always do this for such questions.

average of 4 nos = z% of sum of 4 nos

solve for Z


(12+y+39+76)/4 = z/100 * (12+y+39+76)



C
Cheers !!

Quant 47-Striving for 50
Verbal 34-Striving for 40

My gmat journey :
https://www.beatthegmat.com/710-bblast-s ... 90735.html
My take on the GMAT RC :
https://www.beatthegmat.com/ways-to-bbla ... 90808.html
How to prepare before your MBA:
https://www.youtube.com/watch?v=upz46D7 ... TWBZF14TKW_
Top
User avatar
Community Manager
Posts: 991
Joined: Thu Sep 23, 2010 6:19 am
Location: Bangalore, India
Thanked: 146 times
Followed by:24 members

by shovan85 » Fri Jan 07, 2011 3:40 am
bblast wrote:
(12+y+39+76)/4 = z/100 * (12+y+39+76)
I agree but this will hold true Provided (12+y+39+76) not equal to Zero.
If the problem is Easy Respect it, if the problem is tough Attack it
Top
Legendary Member
Posts: 1337
Joined: Sat Dec 27, 2008 6:29 pm
Thanked: 127 times
Followed by:10 members

by Night reader » Fri Jan 07, 2011 4:37 am
shovan85 wrote:
bblast wrote:
(12+y+39+76)/4 = z/100 * (12+y+39+76)
I agree but this will hold true Provided (12+y+39+76) not equal to Zero.
I must agree with shovan 0*12%=0*20%=0*25%=0*32%, hence E
Top
Post new topic Post Reply
• Page 1 of 1