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What is the average of 0.64(1/2), 0.85, aan 9/10?

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What is the average of 0.64(1/2), 0.85, aan 9/10?  [#permalink]

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New post 01 Mar 2018, 00:30
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A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

88% (00:50) correct 12% (02:21) wrong based on 24 sessions

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What is the average of 0.64(1/2), 0.85, aan 9/10?  [#permalink]

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New post 01 Mar 2018, 00:40
Bunuel wrote:
What is the average of \(\sqrt{0.64}\), 0.85, and 9/10 ?

(A) 21/25

(B) 3.25

(C) 2.55

(D) 85%

(E) 4/5


Simplifying the terms, we will get \(\sqrt{0.64} = 0.8\) and \(\frac{9}{10}\) = 0.9

Therefore, the average of 0.8, 0.90, and 0.85 is 0.85, which is \(85\)% (Option D)
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Re: What is the average of 0.64(1/2), 0.85, aan 9/10?  [#permalink]

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New post 01 Mar 2018, 03:48
[quote="Bunuel"]What is the average of \(\sqrt{0.64}\), 0.85, and 9/10 ?

(A) 21/25

(B) 3.25

(C) 2.55

(D) 85%

(E) 4/5

\sqrt{0.64} means 0.8. second one is 0.85 and 9/10 means 0.9

we can organize these numbers : 0.8 0.85 0.9
middle one is the average whic can be expressed as 85%=0.85
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Re: What is the average of 0.64(1/2), 0.85, aan 9/10?  [#permalink]

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New post 02 Mar 2018, 10:36
Bunuel wrote:
What is the average of \(\sqrt{0.64}\), 0.85, and 9/10 ?

(A) 21/25

(B) 3.25

(C) 2.55

(D) 85%

(E) 4/5


Since √0.64 = 0.8 and 9/10 = 0.9, then the average is:

(0.8 + 0.85 + 0.9)/3 = 0.85 = 85%

Answer: D
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Re: What is the average of 0.64(1/2), 0.85, aan 9/10?  [#permalink]

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New post 03 Mar 2018, 00:54
Bunuel wrote:
What is the average of \(\sqrt{0.64}\), 0.85, and 9/10 ?

(A) 21/25

(B) 3.25

(C) 2.55

(D) 85%

(E) 4/5

IMO D
\(\sqrt{64/100}\) + 85/100+9/10
=80+85+90/100*3
=255/300=85/100
=85%
Re: What is the average of 0.64(1/2), 0.85, aan 9/10? &nbs [#permalink] 03 Mar 2018, 00:54
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