Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 24 Jun 2016, 22:36

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# if the tens digit x and the units digit y of a positive

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
Manager
Joined: 05 Jul 2006
Posts: 197
Followers: 1

Kudos [?]: 45 [0], given: 0

if the tens digit x and the units digit y of a positive [#permalink]

### Show Tags

18 Oct 2006, 16:07
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

if the tens digit x and the units digit y of a positive integer n are reversed, the resulting integer is 9 more than n. What is y in terms of x?

10-x
9-x
x+9
x-1
x+1
Senior Manager
Joined: 31 Jul 2006
Posts: 440
Followers: 3

Kudos [?]: 35 [0], given: 0

Re: y in terms of x [#permalink]

### Show Tags

18 Oct 2006, 17:05
lan583 wrote:
if the tens digit x and the units digit y of a positive integer n are reversed, the resulting integer is 9 more than n. What is y in terms of x?

10-x
9-x
x+9
x-1
x+1

Well I thought of 12 and 21. so y=x+1

I only need to show 1 case to prove it right?
Intern
Joined: 27 Aug 2006
Posts: 18
Followers: 0

Kudos [?]: 1 [0], given: 0

### Show Tags

18 Oct 2006, 18:31
10x + y = n
10y + x = n+9

Solve this equation x = (n-1)/11 and
y = (n+10)/11
= (n-1)/11 + 1
= x + 1
Director
Joined: 23 Jun 2005
Posts: 847
GMAT 1: 740 Q48 V42
Followers: 5

Kudos [?]: 50 [0], given: 1

### Show Tags

18 Oct 2006, 18:38
E

1. Since the difference between the two numbers is less than 10, the difference between the tens digits must be 1 or 0. Since it cannot be 0, it is 1.

2. yx > xy. So y>x.

Combining 1 and 2, y = x+1
VP
Joined: 25 Jun 2006
Posts: 1172
Followers: 3

Kudos [?]: 117 [0], given: 0

### Show Tags

18 Oct 2006, 19:22
E.

89 to 98. then u get hte answer.
Manager
Joined: 31 Aug 2006
Posts: 213
Followers: 1

Kudos [?]: 2 [0], given: 0

### Show Tags

19 Oct 2006, 12:26
Original no. is xy . Number after interchanging is yx. Now as per the Q.
10x+y+9=10y+x
=> 9y=9x+9
=> y=x+1
Senior Manager
Joined: 13 Sep 2006
Posts: 281
Location: New York
Followers: 1

Kudos [?]: 13 [0], given: 0

### Show Tags

19 Oct 2006, 13:01
E - pick numbers such as 23 and 32
_________________

"Never let the fear of striking out get in your wayâ€

[#permalink] 19 Oct 2006, 13:01
Display posts from previous: Sort by

# if the tens digit x and the units digit y of a positive

 post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.