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

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Math Expert
Joined: 02 Sep 2009
Posts: 47109
Susan has an average of 86 in three examinations. What grade must she [#permalink]

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01 Mar 2018, 00:44
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Difficulty:

25% (medium)

Question Stats:

84% (01:03) correct 16% (01:04) wrong based on 32 sessions

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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

_________________
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Joined: 26 Feb 2016
Posts: 2946
Location: India
GPA: 3.12
Re: Susan has an average of 86 in three examinations. What grade must she [#permalink]

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

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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
Senior Manager
Joined: 31 Oct 2013
Posts: 369
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: Susan has an average of 86 in three examinations. What grade must she [#permalink]

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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: 228
Re: Susan has an average of 86 in three examinations. What grade must she [#permalink]

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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
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