A computer can perform 1,000,000 calculations per second. At

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BTGmoderatorDC: Moderator; Posts: 7187; Joined: Thu Sep 07, 2017 4:43 pmFollowed by: 23 members

by BTGmoderatorDC » Sun Dec 29, 2019 5:54 pm

A computer can perform 1,000,000 calculations per second. At this rate, how many hours will it take this computer to perform the 3.6*10^11 calculations required to solve a certain problem?

A. 60
B. 100
C. 600
D. 1,000
E. 6,000

OA B

Source: Official Guide

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Source: Beat The GMAT — Problem Solving | Sun Dec 29, 2019 5:54 pm

SampathKp: Senior | Next Rank: 100 Posts; Posts: 62; Joined: Wed Nov 13, 2019 9:42 pm

by SampathKp » Sun Dec 29, 2019 7:54 pm

BTGmoderatorDC wrote:A computer can perform 1,000,000 calculations per second. At this rate, how many hours will it take this computer to perform the 3.6*10^11 calculations required to solve a certain problem?

A. 60
B. 100
C. 600
D. 1,000
E. 6,000

OA B

Source: Official Guide

Given that in 1 sec a computer can perform 10^6 calculations

so in hour (3600 seconds) a computer can perform 3600 * 10^6 which is 3.6* 10^9 (Converting it into form the question is asked)

So to perform 3.6*10^11 calculations, a computer will need 100 hours.

Answer is B

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swerve: Legendary Member; Posts: 2560; Joined: Sun Oct 29, 2017 2:04 pmFollowed by: 6 members

by swerve » Mon Dec 30, 2019 11:37 am

BTGmoderatorDC wrote:A computer can perform 1,000,000 calculations per second. At this rate, how many hours will it take this computer to perform the 3.6*10^11 calculations required to solve a certain problem?

A. 60
B. 100
C. 600
D. 1,000
E. 6,000

OA B

Source: Official Guide

1 million (6 zeros) per second.

We need to perform 3.6*(10^11). Which is 36*10^10. Let's take out the million (6 zeros so we are left with 4 zeros) 36,0000 Million.

We need the number of hours so let's divide by 3600. (60minutes*60seconds)

360000/3600=100

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Scott@TargetTestPrep: GMAT Instructor; Posts: 8177; Joined: Sat Apr 25, 2015 10:56 amFollowed by: 29 members; Location: Los Angeles, CA; Thanked: 43 times

by Scott@TargetTestPrep » Sun Jan 05, 2020 8:04 pm

BTGmoderatorDC wrote:A computer can perform 1,000,000 calculations per second. At this rate, how many hours will it take this computer to perform the 3.6*10^11 calculations required to solve a certain problem?

A. 60
B. 100
C. 600
D. 1,000
E. 6,000

OA B

Source: Official Guide

We note that 1,000,000 = 10^6. Thus, the number of seconds it takes to perform 3.6*10^11 calculations is:

(3.6*10^11 / 10^6) = 3.6 x 10^5

Since 1 hour = 3600 seconds, the number of hours is:

3.6 x 10^5 / 3.6 x 10^3 = = 10^2 = 100

Answer: B

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