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The value of the expression above is closest to which of the following

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Joined: 29 Oct 2019
Posts: 134
The value of the expression above is closest to which of the following  [#permalink]

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20 Jan 2020, 07:46
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Difficulty:

45% (medium)

Question Stats:

53% (01:01) correct 47% (01:10) wrong based on 34 sessions

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$$\frac{\sqrt{0.089}}{0.03}$$

The value of the expression above is closest to which of the following?

(A) 0.1

(B) 1

(C) 3

(D) 10

(E) 30

Source: GMAT Quantum Math Course
Senior Manager
Joined: 16 Feb 2015
Posts: 355
Location: United States
Re: The value of the expression above is closest to which of the following  [#permalink]

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20 Jan 2020, 21:16
sjuniv32 wrote:
$$\frac{\sqrt{0.089}}{0.03}$$

The value of the expression above is closest to which of the following?

(A) 0.1

(B) 1

(C) 3

(D) 10

(E) 30

Source: GMAT Quantum Math Course

Explanation:

= √0.089 ≅ 0.9

√0.089/0.03 ≅ 0.9/0.03 ≅ 10

IMO-D
GMAT Tutor
Joined: 24 Jun 2008
Posts: 2012
Re: The value of the expression above is closest to which of the following  [#permalink]

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21 Jan 2020, 03:47
1
I think there's a typo in the solution above (the numerator should be 0.3, not 0.9).

Since the answers are very far apart, we can round off liberally. If you recognize that 0.089 is very close to 0.09 = 9/100, which has a simple square root, then we can estimate easily:

√0.089 / 0.03 ~ √0.09 / 0.03 = √(9/100) / (3/100) = (3/10) / (3/100) = 100/10 = 10
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Joined: 04 Jan 2015
Posts: 3256
Re: The value of the expression above is closest to which of the following  [#permalink]

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21 Jan 2020, 07:31

Solution

Given
In this question, we are given that
• An expression: $$\frac{√0.089}{0.03}$$

To find
We need to determine
• The closest approximation of the original value of the expression

Approach and Working out
0.089 can be approximated as 0.09
• √0.09 = 0.3
• Hence, the given expression = $$\frac{0.3}{0.03} = 10$$

Thus, option D is the correct answer.

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Re: The value of the expression above is closest to which of the following   [#permalink] 21 Jan 2020, 07:31
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