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 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!- Dec 17
09:00 AM PST
-10:00 AM PST
Join Manhattan Prep instructor Whitney Garner for a fun—and thorough—review of logic-based (non-math) problems, with a particular emphasis on Data Sufficiency and Two-Parts. - Dec 18
10:00 AM PST
-11:00 AM PST
Here is the essential guide to securing scholarships as an MBA student! In this video, we explore the various types of scholarships available, including need-based and merit-based options.
10 Jun 2018, 04:48
Kudos
Bookmarks
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
85% (01:18) correct
15%
(01:17)
wrong
based on 49
sessions
History
Date
Time
Result
Not Attempted Yet
If bowl S contains only marbles, how many marbles are in bowl S?
(1) If 1/4 of the marbles were removed, the bowl would be filled to 1/2 of its capacity.
(2) If 100 marbles were added, the bowl would be full.
(1) If 1/4 of the marbles were removed, the bowl would be filled to 1/2 of its capacity.
(2) If 100 marbles were added, the bowl would be full.
Azedenkae
Joined: 10 Jun 2018
Last visit: 09 Apr 2019
Posts: 50
Own Kudos:
Given Kudos: 1
Location: Australia
Concentration: Technology, General Management
Schools: Other Schools
GPA: 2.88
WE:Science (Pharmaceuticals and Biotech)
Products:
10 Jun 2018, 05:12
Kudos
Bookmarks
For this question, you have two variables. The number of marbles, and the er, 'filledness' of the bowl (excuse my made-up word). You need a way to link the two variables together at least, for the answer to be somewhat possible. So (1) alone is not sufficient, because we are only talking about proportions of marbles and proportion of the bowl filled, regardless of what the actual fractions are. There's no way to work out the number of marbles in this case. We need to have at least a specific number of marbles corresponding to a proportion, somewhere, to maybe figure it out. (2) specifies a number of marbles, but doesn't correlate this to a particular proportion. So no, (2) is not sufficient either.
Then, if we have both... so from (1), we can figure out that 1/2 of the capacity of the bowl is equal to 3/4th the number of marbles initially there. If that's the case, then at the original number of marbles must be the reciprocal of 3/4 * 1/2, so 4/6 (or rather, 2/3) of the bowl was initially filled with marbles. We can work this backwards to be sure: if the bowl was 2/3 filled, and we took out 1/4th of the marbles, then we have 2/3 * 3/4 = 6/12, or 1/2. Now, knowing how much of the bowl was initially filled, we know from (2) that adding 100 marbles fill up the bowl, so in this case 100 marbles = 1/3rd of the bowl, and thus 2/3rd of the bowl would be filled with 200 marbles, which is also the starting number of marbles.
Tada! I hope. Not a math expert, but that's my two cents. Answer is C.
Then, if we have both... so from (1), we can figure out that 1/2 of the capacity of the bowl is equal to 3/4th the number of marbles initially there. If that's the case, then at the original number of marbles must be the reciprocal of 3/4 * 1/2, so 4/6 (or rather, 2/3) of the bowl was initially filled with marbles. We can work this backwards to be sure: if the bowl was 2/3 filled, and we took out 1/4th of the marbles, then we have 2/3 * 3/4 = 6/12, or 1/2. Now, knowing how much of the bowl was initially filled, we know from (2) that adding 100 marbles fill up the bowl, so in this case 100 marbles = 1/3rd of the bowl, and thus 2/3rd of the bowl would be filled with 200 marbles, which is also the starting number of marbles.
Tada! I hope. Not a math expert, but that's my two cents. Answer is C.
10 Jun 2018, 07:14
Kudos
Bookmarks
Stmt:1 it states the proportion of marble in class bowl ,not about the qty,hence Not sufficient
stmt:2 states 100 marbles added the bowl would be full.we dont know what was the proportion of the volume occupied by marbles initially,Hence insufficient.
Combining 1& 2
We would know from the statement 1 initially 3/4 marbles occupy 1/2 of bowl volume .
then total marble occupy 2/3 of bowl volume ,
From stmt 2:100 marble will be filling 1/3 of bowl volume.We will be able to find the total no of marbles.
hence ans :c
stmt:2 states 100 marbles added the bowl would be full.we dont know what was the proportion of the volume occupied by marbles initially,Hence insufficient.
Combining 1& 2
We would know from the statement 1 initially 3/4 marbles occupy 1/2 of bowl volume .
then total marble occupy 2/3 of bowl volume ,
From stmt 2:100 marble will be filling 1/3 of bowl volume.We will be able to find the total no of marbles.
hence ans :c
