GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 15 Dec 2019, 18:41

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# On an aerial photograph, the surface of a pond appears as

Author Message
TAGS:

### Hide Tags

Senior Manager
Joined: 08 Jun 2004
Posts: 324
Location: Europe
On an aerial photograph, the surface of a pond appears as  [#permalink]

### Show Tags

30 Apr 2006, 08:03
4
21
00:00

Difficulty:

45% (medium)

Question Stats:

65% (01:58) correct 35% (01:50) wrong based on 631 sessions

### HideShow timer Statistics

On an aerial photograph, the surface of a pond appears as circular region of radius 7/16 inch. If a distance of 1 inch on the photograph corresponds to an actual distance of 2 miles, which of the following is the closest estimate of the actual surface area of the pond, in square miles?

A. 1.3
B. 2.4
C. 3.0
D. 3.8
E. 5.0

OPEN DISCUSSION OF THIS QUESTION IS HERE: on-an-aerial-photograph-the-surface-of-a-pond-appears-as-100605.html
Math Expert
Joined: 02 Sep 2009
Posts: 59730
Re: On an aerial photograph, the surface of a pond appears as  [#permalink]

### Show Tags

21 Jul 2015, 02:42
5
6
M8 wrote:
On an aerial photograph, the surface of a pond appears as circular region of radius 7/16 inch. If a distance of 1 inch on the photograph corresponds to an actual distance of 2 miles, which of the following is the closest estimate of the actual surface area of the pond, in square miles?

A. 1.3
B. 2.4
C. 3.0
D. 3.8
E. 5.0

As 1 inch = 2 miles, then 7/16 inches = 2*7/16 = 7/8 miles. So actual radius is 7/8 miles. $$Area=\pi{r^2}\approx{\frac{22}{7}*\frac{49}{64}}\approx{2.4}$$ (as we are asked about the approximate value we can take $$\pi\approx{\frac{22}{7}}$$).

OPEN DISCUSSION OF THIS QUESTION IS HERE: on-an-aerial-photograph-the-surface-of-a-pond-appears-as-100605.html
_________________
CEO
Joined: 07 Jul 2004
Posts: 3327
Location: Singapore
Re: On an aerial photograph, the surface of a pond appears as  [#permalink]

### Show Tags

02 May 2006, 01:25
1
4
7/16 inch = 7/16 * 2 = 7/8 miles.

Area = pi * r^2 = 22/7 * 7/8 * 7/8 = 77/32 = ~2.4
##### General Discussion
Intern
Joined: 19 Apr 2006
Posts: 20
Re: On an aerial photograph, the surface of a pond appears as  [#permalink]

### Show Tags

01 May 2006, 04:22
B as well my estimate was: for r: 2*7/16= 7/8 and then 3*49/64= 150/64
VP
Joined: 29 Apr 2003
Posts: 1204
Re: On an aerial photograph, the surface of a pond appears as  [#permalink]

### Show Tags

03 May 2006, 04:18

B...

Quote of the day: "Time to Charge Ahead!!"
Manager
Joined: 14 Mar 2006
Posts: 138
Re: On an aerial photograph, the surface of a pond appears as  [#permalink]

### Show Tags

03 May 2006, 10:03
B. use the given ratio to convert the radius so, 7/8. area: (7/8)^2 * 3.
I heard we can use Pie=3 on gmat, is that true?
VP
Joined: 29 Apr 2003
Posts: 1204
Re: On an aerial photograph, the surface of a pond appears as  [#permalink]

### Show Tags

03 May 2006, 10:07
shampoo wrote:
B. use the given ratio to convert the radius so, 7/8. area: (7/8)^2 * 3.
I heard we can use Pie=3 on gmat, is that true?

I have seen different values used in different problems. I think it depends on the question and the values given to you. For some 22/7 works very nice as it cancels the given values!
Re: On an aerial photograph, the surface of a pond appears as   [#permalink] 03 May 2006, 10:07
Display posts from previous: Sort by