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# If a certain blood cell has a diameter of 0.008 millimeter, and a cert

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Math Expert
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If a certain blood cell has a diameter of 0.008 millimeter, and a cert  [#permalink]

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16 Nov 2017, 00:54
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Difficulty:

(N/A)

Question Stats:

75% (01:03) correct 25% (01:10) wrong based on 34 sessions

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If a certain blood cell has a diameter of 0.008 millimeter, and a certain muscle cell has a diameter of 0.07 millimeter, then the diameter of the muscle cell is how many times the diameter of the blood cell?

(A) 0.1
(B) 0.8
(C) 1.14
(D) 5.60
(E) 8.75

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Re: If a certain blood cell has a diameter of 0.008 millimeter, and a cert  [#permalink]

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16 Nov 2017, 08:08
diameter of muscle cell / diameter of blood cell
= 0.07 / 0.008
=70 / 8
= 8.75
E
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Re: If a certain blood cell has a diameter of 0.008 millimeter, and a cert  [#permalink]

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16 Nov 2017, 08:24
Bunuel wrote:
If a certain blood cell has a diameter of 0.008 millimeter, and a certain muscle cell has a diameter of 0.07 millimeter, then the diameter of the muscle cell is how many times the diameter of the blood cell?

(A) 0.1
(B) 0.8
(C) 1.14
(D) 5.60
(E) 8.75

$$\frac{0.07}{0.008}$$
$$= 8.75$$ Answer will be (E)
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Re: If a certain blood cell has a diameter of 0.008 millimeter, and a cert  [#permalink]

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17 Nov 2017, 13:38
Bunuel wrote:
If a certain blood cell has a diameter of 0.008 millimeter, and a certain muscle cell has a diameter of 0.07 millimeter, then the diameter of the muscle cell is how many times the diameter of the blood cell?

(A) 0.1
(B) 0.8
(C) 1.14
(D) 5.60
(E) 8.75

The diameter of the muscle cell is 0.07/0.008 = 70/8 = 8.75 times the diameter of the blood cell.

Alternate Solution:

We can set up an equation that relates the two entities:

0.07 = 0.008x

70 = 8x

70/8 = x

Looking at the answer choices, we see that it isn’t necessary to actually perform the division. We estimate that x is between 8 and 9.

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Re: If a certain blood cell has a diameter of 0.008 millimeter, and a cert &nbs [#permalink] 17 Nov 2017, 13:38
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# If a certain blood cell has a diameter of 0.008 millimeter, and a cert

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