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

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Math Expert
Joined: 02 Sep 2009
Posts: 52431
What is the average of 0.64(1/2), 0.85, aan 9/10?  [#permalink]

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28 Feb 2018, 23:30
00:00

Difficulty:

35% (medium)

Question Stats:

79% (01:05) correct 21% (02:08) wrong based on 25 sessions

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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

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

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28 Feb 2018, 23:40
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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01 Mar 2018, 02:48
[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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02 Mar 2018, 09:36
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%

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

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02 Mar 2018, 23:54
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] 02 Mar 2018, 23:54
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