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

 It is currently 22 Feb 2019, 19:17

### 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

## Events & Promotions

###### Events & Promotions in February
PrevNext
SuMoTuWeThFrSa
272829303112
3456789
10111213141516
17181920212223
242526272812
Open Detailed Calendar
• ### Free GMAT RC Webinar

February 23, 2019

February 23, 2019

07:00 AM PST

09:00 AM PST

Learn reading strategies that can help even non-voracious reader to master GMAT RC. Saturday, February 23rd at 7 AM PT
• ### FREE Quant Workshop by e-GMAT!

February 24, 2019

February 24, 2019

07:00 AM PST

09:00 AM PST

Get personalized insights on how to achieve your Target Quant Score.

# The average of a and b is 70. The average of a and c is 100. What is b

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 53066
The average of a and b is 70. The average of a and c is 100. What is b  [#permalink]

### Show Tags

20 Jan 2019, 23:59
00:00

Difficulty:

(N/A)

Question Stats:

100% (01:16) correct 0% (00:00) wrong based on 7 sessions

### HideShow timer Statistics

The average of a and b is 70. The average of a and c is 100. What is b – c?

A –60
B –30
C 15
D 30
E 60

_________________
Director
Joined: 18 Jul 2018
Posts: 679
Location: India
Concentration: Finance, Marketing
WE: Engineering (Energy and Utilities)
Re: The average of a and b is 70. The average of a and c is 100. What is b  [#permalink]

### Show Tags

21 Jan 2019, 00:27
a+b = 140.........(1)
a+c = 200..........(2)
(1)-(2) = -60

_________________

Press +1 Kudo If my post helps!

VP
Joined: 31 Oct 2013
Posts: 1162
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: The average of a and b is 70. The average of a and c is 100. What is b  [#permalink]

### Show Tags

21 Jan 2019, 03:31
Bunuel wrote:
The average of a and b is 70. The average of a and c is 100. What is b – c?

A –60
B –30
C 15
D 30
E 60

a + b/2 = 70

a + b = 140.

again,

a + c / 2 = 100

a + c = 200

a + b = 140
a + c = = 200
.........................................
b - c = -60...............................deducting second from the first one.

SVP
Joined: 18 Aug 2017
Posts: 1928
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
Re: The average of a and b is 70. The average of a and c is 100. What is b  [#permalink]

### Show Tags

21 Jan 2019, 07:11
Bunuel wrote:
The average of a and b is 70. The average of a and c is 100. What is b – c?

A –60
B –30
C 15
D 30
E 60

a+b= 140
a+c=200

a+b-a-c = 140-200
= -60
IMO A
_________________

If you liked my solution then please give Kudos. Kudos encourage active discussions.

Re: The average of a and b is 70. The average of a and c is 100. What is b   [#permalink] 21 Jan 2019, 07:11
Display posts from previous: Sort by