Last visit was: 24 Apr 2026, 08:59 It is currently 24 Apr 2026, 08:59
Home
Messages
Tests
Schools
Events
Close
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
Your Progress

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
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
Back to Forum
Create Topic
User avatar
The age of the Earth is approximately 1.3*10^17 seconds, and one year Updated on: 30 Oct 2017, 04:43
Originally posted by angelfire213 on 28 Oct 2014, 17:37.
Last edited by Bunuel on 30 Oct 2017, 04:43, edited 2 times in total.
Formatted options.
3
Kudos
Add Kudos
42
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

25% (medium)

Question Stats:

78% (01:43) correct 22% (01:54) wrong based on 1380 sessions

History

Date
Time
Result
Not Attempted Yet
The age of the Earth is approximately \(1.3*10^{17}\) seconds, and one year is approximately \(3.2 * 10^7\) seconds. Which of the following is closest to the age of the Earth in years?

A. \(2.5 *10^9\)

B. \(4.1 * 10^9\)

C. \(1.9* 10^{10}\)

D. \(2.5* 10^{11}\)

E. \(4.1 * 10^{11}\)
ShowHide Answer
Official Answer
B
Every tricky question should trigger a follow up quiz. Build that habit with GMAT Club Forum Quiz →.
Most Helpful Reply
avatar
PareshGmat
avatar
Joined: 27 Dec 2012
Last visit: 10 Jul 2016
Posts: 1,531
Own Kudos:
8,274
 [46]
Given Kudos: 193
Status:The Best Or Nothing
Location: India
Concentration: General Management, Technology
WE:Information Technology (Computer Software)
Posts: 1,531
Kudos: 8,274
 [46]
The age of the Earth is approximately 1.3*10^17 seconds, and one year 28 Oct 2014, 21:09
30
Kudos
Add Kudos
16
Bookmarks
Bookmark this Post
1 Year \(= 3.2 * 10^7\) seconds, so \(1.3*10^{17}\) seconds would be =

\(\frac{1.3 * 10^{17}}{3.2 * 10^7} = \frac{130*10^{15}}{32*10^6} = 4.1*10^9\) Years

Answer = B
General Discussion
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 24 Apr 2026
Posts: 109,814
Own Kudos:
811,028
 [3]
Given Kudos: 105,871
Products:
GMAT Club Tests Forum Quiz
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 109,814
Kudos: 811,028
 [3]
The age of the Earth is approximately 1.3*10^17 seconds, and one year 29 Oct 2014, 04:04
1
Kudos
Add Kudos
2
Bookmarks
Bookmark this Post
angelfire213
The age of the Earth is approximately 1.3*10^17 seconds, and one year is approximately 3.2 * 10^7 seconds. Which of the following is closest to the age of the Earth in years?

A. 2.5 *10^9
B. 4.1 * 10^9
C. 1.9* 10^10
D. 2.5* 10^11
E. 4.1 * 10^11
Show more

Check other Conversion problems to practice in Special Questions Directory.
avatar
petocities
avatar
Joined: 26 Jul 2015
Last visit: 24 Jun 2016
Posts: 17
Own Kudos:
21
Given Kudos: 16
Location: Chile
Schools: Sloan '18 Haas '18 HBS '18 (S) Kellogg '18 (S) Wharton '18 CBS '18 Stern '18
GMAT 1: 620 Q38 V37
GMAT 2: 690 Q49 V35
WE:Analyst (Consulting)
Schools: Sloan '18 Haas '18 HBS '18 (S) Kellogg '18 (S) Wharton '18 CBS '18 Stern '18
GMAT 2: 690 Q49 V35
Posts: 17
Kudos: 21
The age of the Earth is approximately 1.3*10^17 seconds, and one year 24 Oct 2015, 13:07
Kudos
Add Kudos
Bookmarks
Bookmark this Post
I wanted to ask for some help, since I cannot find my mistake.
What I tried to do was:

\(\frac{1.3*10^{17}}{3.2*10^7} = 1.3*3.2*10^7 = 4.16*10^7\)

What am I doing wrong?

Thanks in advance!
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 24 Apr 2026
Posts: 109,814
Own Kudos:
811,028
Given Kudos: 105,871
Products:
GMAT Club Tests Forum Quiz
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 109,814
Kudos: 811,028
The age of the Earth is approximately 1.3*10^17 seconds, and one year 25 Oct 2015, 05:53
Kudos
Add Kudos
Bookmarks
Bookmark this Post
petocities
I wanted to ask for some help, since I cannot find my mistake.
What I tried to do was:

1.3*10^17/3.2*10^7 = 1.3*3.2*10^7 = 4.16*10^7

What am I doing wrong?

Thanks in advance!
Show more

1.3*10^17/3.2*10^7 = 1.3/3.2*10^10 = ~0.4*10^10 = 4*10*9.
User avatar
KarishmaB
User avatar
Joined: 16 Oct 2010
Last visit: 23 Apr 2026
Posts: 16,442
Own Kudos:
79,404
 [4]
Given Kudos: 485
Location: Pune, India
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 16,442
Kudos: 79,404
 [4]
The age of the Earth is approximately 1.3*10^17 seconds, and one year 20 Dec 2017, 04:12
3
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
angelfire213
The age of the Earth is approximately \(1.3*10^{17}\) seconds, and one year is approximately \(3.2 * 10^7\) seconds. Which of the following is closest to the age of the Earth in years?

A. \(2.5 *10^9\)

B. \(4.1 * 10^9\)

C. \(1.9* 10^{10}\)

D. \(2.5* 10^{11}\)

E. \(4.1 * 10^{11}\)
Show more

Or simply approximate:

1.3/3.2 is a bit less than 1/2 (i.e. less than 0.5).
\(10^{17}/10^7\) will give \(10^{10}\).

Of the given options, \(4.1 * 10^9\) works.
User avatar
hemantbafna
User avatar
Joined: 30 Jan 2020
Last visit: 02 Mar 2021
Posts: 162
Own Kudos:
90
 [1]
Given Kudos: 527
Location: India
WE:Accounting (Accounting)
Posts: 162
Kudos: 90
 [1]
The age of the Earth is approximately 1.3*10^17 seconds, and one year 10 Aug 2020, 10:46
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
angelfire213
The age of the Earth is approximately \(1.3*10^{17}\) seconds, and one year is approximately \(3.2 * 10^7\) seconds. Which of the following is closest to the age of the Earth in years?

A. \(2.5 *10^9\)

B. \(4.1 * 10^9\)

C. \(1.9* 10^{10}\)

D. \(2.5* 10^{11}\)

E. \(4.1 * 10^{11}\)
Show more


To find the age = Age in sec/Year in sec

=1.3*10^{17}/3.2 * 10^7=130*10^9/32=4.1*10^9
User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 38,974
Own Kudos:
1,117
Posts: 38,974
Kudos: 1,117
The age of the Earth is approximately 1.3*10^17 seconds, and one year 19 Aug 2025, 12:16
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Automated notice from GMAT Club BumpBot:

A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.

This post was generated automatically.
Moderators:
Bunuel
Math Expert
109814 posts
Krunaal
Tuck School Moderator
853 posts