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 Your Progress

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.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Both a, b, and c are 3-digits integers, where a=b+c. Is the [#permalink]

Show Tags

27 Jun 2009, 21:30

00:00

A

B

C

D

E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions

HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

. Both a, b, and c are 3-digits integers, where a=b+c. Is the hundreds' digit of number a equal to sum of that of b and c? 1). Tens' digit of a=tens' digit of b+tens' digit of c 2). Units' digit of a=units' digit of b + units' digit of c

Let the number be as follows a = 100D + 10E + F b = 100G + 10H + I c = 100J + 10K + L

As per question a = b + c 100D + 10E + F = (100G + 10H + I) + (100J + 10K + L)

stmt 1. E = H + K Not suff. as the sum of LHS and RHS can be influenced by G,J,I and L.

Stmt. 2 F = I + L Not suff. due to same reason as for stm. 1.

Combine 100D + 10E + F = 100G + 100J + 10h + 10K + I + L 100D + 10E + F = 100G + 100J + 10(h+k) + F 100D + 10E + F = 100(g+j) + 10E + F Lookign at the above eq. 100D = 100(G+J) or d = G+J. Hence suff.

. Both a, b, and c are 3-digits integers, where a=b+c. Is the hundreds' digit of number a equal to sum of that of b and c? 1). Tens' digit of a=tens' digit of b+tens' digit of c 2). Units' digit of a=units' digit of b + units' digit of c

This is basically a problem that asks us to determine whether there were any numbers carried over from the previous units in the addition process.

1 - Not enough. We know if the tens' digits do not add up to 10, then nothing will be carried over. We know the tens' digits of B & C do not add to 10, but we don't know whether anything carried over from the addition of the units' digits, which might in turn push the sum of the tens' digits over 10. 2 - Also not enough for the same reason above. We know the addition of the units' digits won't carry over to the tens, but we don't know anything about the tens' digits.

Combined: Enough, we know neither the units nor the tens will carry over additional numbers, so the sum of the hundreds' digits will not include anything carried over.

Statement 1 can only be true when there are no carry forwards from units to tens, and also from tens to hundreds. Though i have not checked out all the alternatives as it would take a lot of time, i personally feel sufficiently confident about this, and would rather have it answered wrong than waste time in attempting to check all alternatives.

If there are no carry forwards from tens to hundreds, the sum of hundreds digits of b and c will be equal to that of a.

1). Tens' digit of a=tens' digit of b+tens' digit of c

the only thing that I can conclude from this statement is , nothing got carried from units place...but I cant tell whether anything got carried over to the hundreds place..

281 +372 ------ 653 <-- here tens digit of the result is still equal to the tens digit of b and tens digit of c

one more case

231 +321 ------ 552 <-- here nothing is carried forward still the statement 1 holds good.

. Both a, b, and c are 3-digits integers, where a=b+c. Is the hundreds' digit of number a equal to sum of that of b and c? 1). Tens' digit of a=tens' digit of b+tens' digit of c 2). Units' digit of a=units' digit of b + units' digit of c

I also think it should be A as there is no carry forward from the tens digit. Anyway whats the OA ?