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If the average of 5 numbers is 36 and the average of four of those num

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Math Expert
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If the average of 5 numbers is 36 and the average of four of those num  [#permalink]

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New post 03 Jan 2019, 12:28
1
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

89% (01:06) correct 11% (00:53) wrong based on 35 sessions

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Re: If the average of 5 numbers is 36 and the average of four of those num  [#permalink]

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New post 03 Jan 2019, 13:05
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Hi Bunuel Please check the wordings of this question. I can spot some typos. Thanks


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Re: If the average of 5 numbers is 36 and the average of four of those num  [#permalink]

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New post 03 Jan 2019, 13:07
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Re: If the average of 5 numbers is 36 and the average of four of those num  [#permalink]

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New post 03 Jan 2019, 13:37
Correct answer: E

First set up the 5 number average:
36 = x/5
Solve for x
x = 180

Now set up the 4 number average:
34 = x - y / 4
Solve for y
34 = 180 - y / 4
y = 44
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Re: If the average of 5 numbers is 36 and the average of four of those num  [#permalink]

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New post 06 Jan 2019, 05:30
Bunuel wrote:
If the average of 5 numbers is 36 and the average of four of those numbers is 34, then what is the value of the fifth number?

(A) 2
(B) 34
(C) 35
(D) 36
(E) 44



sum of 5 no ; 36*5= 180
sum of 4 no : 34 *4 = 136
5th no = 180-136

= 44 IMO E
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Re: If the average of 5 numbers is 36 and the average of four of those num   [#permalink] 06 Jan 2019, 05:30
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