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Divide 64*5^(1/2) by 3*5^(1/2).

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Divide 64*5^(1/2) by 3*5^(1/2).  [#permalink]

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New post 04 Mar 2018, 23:04
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

93% (00:34) correct 7% (01:02) wrong based on 68 sessions

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Re: Divide 64*5^(1/2) by 3*5^(1/2).  [#permalink]

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New post 05 Mar 2018, 04:49
Bunuel wrote:
Divide \(6\sqrt{45}\) by \(3\sqrt{5}\).

(A) 4
(B) 6
(C) 9
(D) 15
(E) 54



\(6\sqrt{45}\) / \(3\sqrt{5}\) = \(6\sqrt{9}\sqrt{5} / 3\sqrt{5}\)

\(= 6*3 / 3 = 6\)

Answer: option B
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Re: Divide 64*5^(1/2) by 3*5^(1/2).  [#permalink]

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New post 05 Mar 2018, 05:57
Bunuel wrote:
Divide \(6\sqrt{45}\) by \(3\sqrt{5}\).

(A) 4
(B) 6
(C) 9
(D) 15
(E) 54

\(\frac{6√ 45}{3√ 5}\)

Or, \(\frac{18√5}{3√ 5}\)

Or, 6 , Answer must be (B)
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Re: Divide 64*5^(1/2) by 3*5^(1/2).  [#permalink]

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New post 06 Mar 2018, 10:20
Bunuel wrote:
Divide \(6\sqrt{45}\) by \(3\sqrt{5}\).

(A) 4
(B) 6
(C) 9
(D) 15
(E) 54


(6√45)/(3√5) = 2√9 = 2 x 3 = 6

Answer: B
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Re: Divide 64*5^(1/2) by 3*5^(1/2).  [#permalink]

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New post 06 Mar 2018, 10:29
Bunuel wrote:
Divide \(6\sqrt{45}\) by \(3\sqrt{5}\).

(A) 4
(B) 6
(C) 9
(D) 15
(E) 54



=18\sqrt{5}/3\sqrt{5}
=6
Answer B
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Re: Divide 64*5^(1/2) by 3*5^(1/2).  [#permalink]

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New post 13 Mar 2018, 09:15
1
IMO B. But the OA is E!! Can anyone explain?
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Re: Divide 64*5^(1/2) by 3*5^(1/2).  [#permalink]

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New post 13 Mar 2018, 09:22
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Re: Divide 64*5^(1/2) by 3*5^(1/2).   [#permalink] 13 Mar 2018, 09:22
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Divide 64*5^(1/2) by 3*5^(1/2).

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