 It is currently 25 Mar 2019, 08:40 ### 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

#### Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here. # a and b are the digits of a two- digit number ab, and b = a  Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:
Moderator  Joined: 18 Apr 2015
Posts: 5909
Followers: 96

Kudos [?]: 1156 , given: 5484

a and b are the digits of a two- digit number ab, and b = a [#permalink]
Expert's post 00:00

Question Stats: 53% (00:54) correct 46% (01:09) wrong based on 30 sessions
a and b are the digits of a two- digit number ab, and b = a + 3.

 Quantity A Quantity B The positive two-digit number $$ab$$ The positive two-digit number $$ba$$

A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given
[Reveal] Spoiler: OA

_________________ Director  Joined: 07 Jan 2018
Posts: 604
Followers: 7

Kudos [?]: 546  , given: 88

Re: a and b are the digits of a two- digit number ab, and b = a [#permalink]
1
KUDOS
Given that $$ab$$ is a two digit number $$a$$ cannot be $$0$$ since $$0b = b$$

so probable values for $$a =1,2,3,4,5,6$$
$$a$$ cannot also be more than $$6$$ since a is an integer and adding $$3$$ to $$7$$ or more will make b a two digit number in itself which is not possible
for every given value of $$a$$ in the list in order, $$b = 4,5,6,7,8,9$$

so $$ab = 14,25,36,47,58,69$$
hence, $$ba = 41,52,63,74,85,96$$

comparing $$ab$$ to $$ba$$ according to the respective $$1st-6th$$ term above
B>A
_________________

This is my response to the question and may be incorrect. Feel free to rectify any mistakes Intern Joined: 05 Jun 2017
Posts: 8
Followers: 0

Kudos [?]: 8  , given: 0

Re: a and b are the digits of a two- digit number ab, and b = a [#permalink]
1
KUDOS
Side A:
we are given b = a + 3
ab can be written as
10*a + b
=10a + a + 3
11a + 3

Side B:
ba can be written as
10b + a
= 10(a+3) + a
= 11a + 30

Therefore Side B is greater Re: a and b are the digits of a two- digit number ab, and b = a   [#permalink] 23 Apr 2018, 14:13
Display posts from previous: Sort by

# a and b are the digits of a two- digit number ab, and b = a  Question banks Downloads My Bookmarks Reviews Important topics Powered by phpBB © phpBB Group Kindly note that the GRE® test is a registered trademark of the Educational Testing Service®, and this site has neither been reviewed nor endorsed by ETS®.