Forum Home > GMAT > Quantitative > Problem Solving (PS)
Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Dec 1310:00 AM EST
-12:00 PM EST
Have you ever wondered how to score a PERFECT 805 on the GMAT? Meet Julia, a banking professional who used the Target Test Prep course to achieve this incredible feat. Julia's story is nothing short of an inspiration.
Dec 1410:00 AM EST
-12:00 PM EST
Think a 100% GMAT Verbal score is out of your reach? Target Test Prep will make you think again! Our course uses techniques such as topical study and spaced repetition to maximize knowledge retention and make studying simple and fun.
Dec 1411:00 AM IST
-01:00 PM IST
Attend this session to learn how to Deconstruct arguments, Pre-Think Author’s Assumptions, and apply Negation Test.- Dec 15
11:00 AM IST
-01:00 PM IST
Attend this free GMAT Algebra Webinar and learn how to master the most challenging Inequalities and Absolute Value problems with ease. 
Dec 1608:00 AM PST
-11:59 PM PST
GMAT Club 12 Days of Christmas is a 4th Annual GMAT Club Winter Competition based on solving questions. This is the Winter GMAT competition on GMAT Club with an amazing opportunity to win over $40,000 worth of prizes!
10 Aug 2010, 05:48
Kudos
Bookmarks
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
78% (01:19) correct
22%
(01:06)
wrong
based on 93
sessions
History
Date
Time
Result
Not Attempted Yet
Is a 3-digit integer divisible by 3?
(1) The hundreds' digit of the number is equal to the tens' digit of the number.
(2) The units' digit of the number is 6 greater than the tens' digit of the number
(1) The hundreds' digit of the number is equal to the tens' digit of the number.
(2) The units' digit of the number is 6 greater than the tens' digit of the number
A little confused
I'll start by naming the integers A B C
(1) if 100's digit is = 10's digit then A = B so it now becomes A A C unit place is not given so INSUFF
(2) if unit digit is 6 greater than the 10's digit the number will read as A B 6+B since 100's digit is not given it still is INSUFF (to me)
BOTH together then it will read something like this A A 6+A
so the numbers will be either 116 , 227 or 339 to me it is still INSUFF and i picked E
where am i going wrong ??
Sorry about posting in such a short time My exam is very very close!!!!
I'll start by naming the integers A B C
(1) if 100's digit is = 10's digit then A = B so it now becomes A A C unit place is not given so INSUFF
(2) if unit digit is 6 greater than the 10's digit the number will read as A B 6+B since 100's digit is not given it still is INSUFF (to me)
BOTH together then it will read something like this A A 6+A
so the numbers will be either 116 , 227 or 339 to me it is still INSUFF and i picked E
where am i going wrong ??
Sorry about posting in such a short time My exam is very very close!!!!
10 Aug 2010, 06:23
Kudos
Bookmarks
amijags
Is a 3-digit integer divisible by 3?
(1) The hundreds' digit of the number is equal to the tens' digit of the number.
(2) The units' digit of the number is 6 greater than the tens' digit of the number
OA
A little confused
I'll start by naming the integers A B C
(1) if 100's digit is = 10's digit then A = B so it now becomes A A C unit place is not given so INSUFF
(2) if unit digit is 6 greater than the 10's digit the number will read as A B 6+B since 100's digit is not given it still is INSUFF (to me)
BOTH together then it will read something like this A A 6+A
so the numbers will be either 116 , 227 or 339 to me it is still INSUFF and i picked E
where am i going wrong ??
Sorry about posting in such a short time My exam is very very close!!!!
(1) The hundreds' digit of the number is equal to the tens' digit of the number.
(2) The units' digit of the number is 6 greater than the tens' digit of the number
OA
A little confused
I'll start by naming the integers A B C
(1) if 100's digit is = 10's digit then A = B so it now becomes A A C unit place is not given so INSUFF
(2) if unit digit is 6 greater than the 10's digit the number will read as A B 6+B since 100's digit is not given it still is INSUFF (to me)
BOTH together then it will read something like this A A 6+A
so the numbers will be either 116 , 227 or 339 to me it is still INSUFF and i picked E
where am i going wrong ??
Sorry about posting in such a short time My exam is very very close!!!!
First # should be 117, which is divisible by 3 and second number should be 228, which is also divisible by 3. So all 3 numbers possible: 117, 228 and 339 are divisible by 3.
Is a 3-digit integer divisible by 3?
Algebraic solution:
A number is divisible by 3 if the sum of its digits is divisible by 3. So 3-digit integer \(abc\) will be divisible by 3 if \(a+b+c=3k\), where k is integer or to make it simpler if \(a+b+c\) is a multiple of 3.
(1) The hundreds' digit of the number is equal to the tens' digit of the number --> \(a=b\) --> \(a+b+c=b+b+c=2b+c\). Now, \(2b+c\) may or may not be a multiple of 3, hence this statement is insufficient.
(2) The units' digit of the number is 6 greater than the tens' digit of the number --> \(c=b+6\) --> \(a+b+c=a+b+b+6=a+2b+6\). Now, \(a+2b+6\) may or may not be a multiple of 3, hence this statement is insufficient.
(1)+(2) As from (1) \(a=b\) and from (2) \(c=b+6\) then \(a+b+c=b+b+b+6=3b+6=3(b+2)\). As \(3(b+2)\) has 3 as multiple hence it's divisible by 3. Sufficient.
Answer: C.
! |
Please post PS questions in the PS subforum: gmat-problem-solving-ps-140/ Please post DS questions in the DS subforum: gmat-data-sufficiency-ds-141/ |
