It is currently 24 Mar 2018, 01:30

### 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 June
Open Detailed Calendar

# Susan has an average of 86 in three examinations. What grade must she

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 44421
Susan has an average of 86 in three examinations. What grade must she [#permalink]

### Show Tags

01 Mar 2018, 00:44
00:00

Difficulty:

(N/A)

Question Stats:

83% (01:01) correct 17% (01:10) wrong based on 23 sessions

### HideShow timer Statistics

Susan has an average of 86 in three examinations. What grade must she receive on her next test to raise her average to 88?

(A) 94

(B) 90

(C) 92

(D) 100

(E) 96
[Reveal] Spoiler: OA

_________________
BSchool Forum Moderator
Joined: 26 Feb 2016
Posts: 2305
Location: India
GPA: 3.12
Re: Susan has an average of 86 in three examinations. What grade must she [#permalink]

### Show Tags

01 Mar 2018, 01:28
Bunuel wrote:
Susan has an average of 86 in three examinations. What grade must she receive on her next test to raise her average to 88?

(A) 94

(B) 90

(C) 92

(D) 100

(E) 96

Let the grade in the fourth test be x

$$\frac{86*3 + x}{4} = 88$$ --> x = $$88*4 - 86*3 = 352 - 258 = 94$$

Therefore, Susan scored a 94(Option A) in her next test.

Alternate approach
In the first three tests, she scores $$2*3 = 6$$ less than the average.

Therefore, Susan would have scored $$88 + 6 = 94$$ in her last test!
_________________

Stay hungry, Stay foolish

Intern
Joined: 11 Feb 2017
Posts: 2
Susan has an average of 86 in three examinations. What grade must she [#permalink]

### Show Tags

01 Mar 2018, 01:53
Bunuel wrote:
Susan has an average of 86 in three examinations. What grade must she receive on her next test to raise her average to 88?

(A) 94

(B) 90

(C) 92

(D) 100

(E) 96

New required average-Old avg= 88-86=2
This number 2 has to be added to all four test scores to get the required avg 2*4=8
required test score = 86+8=94.
ANS A
Intern
Joined: 31 Oct 2013
Posts: 32
Re: Susan has an average of 86 in three examinations. What grade must she [#permalink]

### Show Tags

01 Mar 2018, 02:25
Bunuel wrote:
Susan has an average of 86 in three examinations. What grade must she receive on her next test to raise her average to 88?

(A) 94

(B) 90

(C) 92

(D) 100

(E) 96

in three exams susan has average of 86.
total: 86*3=258
he want to up his average to 88 in 4 exams.
total: 4*88=352
difference= 352-258=94
thus he has to secure 94 in 4th exam in order to keep his average grade 88 in total 4 exams.
Manager
Joined: 23 Sep 2016
Posts: 217
Re: Susan has an average of 86 in three examinations. What grade must she [#permalink]

### Show Tags

03 Mar 2018, 04:02
Bunuel wrote:
Susan has an average of 86 in three examinations. What grade must she receive on her next test to raise her average to 88?

(A) 94

(B) 90

(C) 92

(D) 100

(E) 96

IMO A
total of 3 tests= 3*86=258
258+x/4=88 (where x is new score in next exam)
88*4-258=x
352-258=x
94=x
Re: Susan has an average of 86 in three examinations. What grade must she   [#permalink] 03 Mar 2018, 04:02
Display posts from previous: Sort by