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# Which of the following is the closest approximation to

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Manager
Joined: 07 Jun 2017
Posts: 177
Location: India
Concentration: Technology, General Management
GMAT 1: 660 Q46 V38
GPA: 3.6
WE: Information Technology (Computer Software)
Which of the following is the closest approximation to  [#permalink]

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26 Oct 2017, 22:37
1
00:00

Difficulty:

85% (hard)

Question Stats:

46% (01:04) correct 54% (02:01) wrong based on 63 sessions

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Which of the following is the closest approximation to $$[\sqrt{73} * \sqrt{239}] ÷ [\sqrt{7.2} + \sqrt{15.7}]$$?

A. 10
B. 15
C. 20
D. 25
E. 30

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Naveen
email: nkmungila@gmail.com
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Manager
Joined: 19 Jun 2017
Posts: 50
GMAT 1: 660 Q39 V40
GMAT 2: 700 Q45 V41
Which of the following is the closest approximation to  [#permalink]

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27 Oct 2017, 01:51
73 is some number between 8^2 and 9^2. Since it is closer to 64, lets take its square root as 8.
239 is close to 225 which has a square root of 15. Hence lets take it as 15.

15x8 = 120

Square root of 7.2 is some number between 2 and 3 since 2^2 is 4 and 3^2 is 9. Assume it to be 2.
Square root of 15.7 is some number slightly less than 4, since 4^2 = 16. Hence take it to be 4.

4+2 = 6

Therefore 120/6 = 20

Which of the following is the closest approximation to &nbs [#permalink] 27 Oct 2017, 01:51
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