Que: Find the number of keystrokes required to type numbers from 1 to 900?
(A) 2,583
(B) 2,589
(C) 2,590
(D) 2,592
(E) 2,593
5-Day Free Trial
5-day free, full-access trial TTP
Available with Beat the GMAT members only code
MORE DETAILS
Que: Find the number of keystrokes required to type numbers from 1 to 900?
This topic has expert replies
-
Max@Math Revolution
- Elite Legendary Member
- Posts: 3991
- Joined: Fri Jul 24, 2015 2:28 am
- Location: Las Vegas, USA
- Thanked: 19 times
- Followed by:37 members
Timer
00:00
Your Answer
A
B
C
D
E
Global Stats
Math Revolution
The World's Most "Complete" GMAT Math Course!
Score an excellent Q49-51 just like 70% of our students.
[Free] Full on-demand course (7 days) - 100 hours of video lessons, 490 lesson topics, and 2,000 questions.
[Course] Starting $79 for on-demand and $60 for tutoring per hour and $390 only for Live Online.
Email to : [email protected]
-
Max@Math Revolution
- Elite Legendary Member
- Posts: 3991
- Joined: Fri Jul 24, 2015 2:28 am
- Location: Las Vegas, USA
- Thanked: 19 times
- Followed by:37 members
Solution: The number range is from 1 to 900.
One digit numbers = 1 to 9 = 9 [Will need 1 key stroke each] = 9 key strokes
Two digit numbers = 10 to 99 [Will need 2 key stroke each] = 90 * 2 = 180 key strokes
Three digit numbers = 100 to 900 [Will need 3 key stroke each] = 801 * 3 = 2403 key strokes
Total keystrokes = 9 + 180 + 2403 = 2592
Therefore, D is the correct answer.
Answer D
One digit numbers = 1 to 9 = 9 [Will need 1 key stroke each] = 9 key strokes
Two digit numbers = 10 to 99 [Will need 2 key stroke each] = 90 * 2 = 180 key strokes
Three digit numbers = 100 to 900 [Will need 3 key stroke each] = 801 * 3 = 2403 key strokes
Total keystrokes = 9 + 180 + 2403 = 2592
Therefore, D is the correct answer.
Answer D
Math Revolution
The World's Most "Complete" GMAT Math Course!
Score an excellent Q49-51 just like 70% of our students.
[Free] Full on-demand course (7 days) - 100 hours of video lessons, 490 lesson topics, and 2,000 questions.
[Course] Starting $79 for on-demand and $60 for tutoring per hour and $390 only for Live Online.
Email to : [email protected]
