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.
Jul 2710:00 AM PDT
-11:00 AM PDT
Are you struggling with the GMAT verbal section? Do tricky questions and lengthy passages overwhelm you? Don't worry—I've got you covered! In this video, I'll provide a detailed, actionable plan to help you significantly boost your verbal score.
Jul 2508:00 AM EDT
-11:59 PM EDT
More and more TTP students are earning impressive scores on the GMAT. Now is the perfect time to join the many GMAT students who made the switch to TTP and surpassed their wildest expectations on test day.- Jul 28
10:00 AM PDT
-11:00 AM PDT
We will learn how to guess an answer choice better on the GMAT. If you are running out of time and want to guess on a few questions, these effective techniques will help you in making a smart guess. 
Jul 2811:00 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.- Jul 31
05:55 AM PDT
-12:30 PM PDT
MBA Application Walkthrough and Essay Review. You will have a chance to hear from experts covering the Top 15 MBA programs, covering details of the application and essays. 
Jul 3110:00 AM EDT
-11:59 PM PDT
Save 20% on Target Test Prep and Score in the 100th Percentile in GMAT Verbal! Our course uses techniques such as topical study and spaced repetition to maximize knowledge retention and make studying simple and fun.
Machine A is made up of a rectangular box filled with x cylinders of b
[#permalink]
12 Feb 2015, 07:10
12 Feb 2015, 07:10
9
Bookmarks
Expert Reply
Show timer
00:00
A
B
C
D
E
Difficulty:
55%
(hard)
Question Stats:
62% (02:05) correct
38%
(02:04)
wrong
based on 268
sessions
Machine A is made up of a rectangular box filled with x cylinders of ball bearings placed together such that the diameter of the bearings and the cylinders are equal, and the cylinders line up evenly, touching, with no extra room inside the box. If the cylinders are the same height as the box, and the box is 18 inches long and 10 inches wide, what’s the value of x?
(1) 9 cylinders can line up along the length of the box.
(2) Each ball bearing has a radius of 1.
Kudos for a correct solution.
(1) 9 cylinders can line up along the length of the box.
(2) Each ball bearing has a radius of 1.
Kudos for a correct solution.
Re: Machine A is made up of a rectangular box filled with x cylinders of b
[#permalink]
16 Feb 2015, 06:23
16 Feb 2015, 06:23
1
Bookmarks
Expert Reply
Bunuel wrote:
Machine A is made up of a rectangular box filled with x cylinders of ball bearings placed together such that the diameter of the bearings and the cylinders are equal, and the cylinders line up evenly, touching, with no extra room inside the box. If the cylinders are the same height as the box, and the box is 18 inches long and 10 inches wide, what’s the value of x?
(1) 9 cylinders can line up along the length of the box.
(2) Each ball bearing has a radius of 1.
Kudos for a correct solution.
(1) 9 cylinders can line up along the length of the box.
(2) Each ball bearing has a radius of 1.
Kudos for a correct solution.
VERITAS PREP OFFICIAL SOLUTION
The correct response is (D). In order to find the value of x, we need to know the diameter of each cylinder. This is given to up by Statement (2) since twice the radius of the ball bearing will equal the cylinder’s diameter. If each cylinder has a diameter of 2, then 45 will fit inside the box. Statement (1) is also sufficient. If the box is 18 inches long and 9 cylinders fit along that length, then they must each have a diameter of 2.
If you chose (A), Statement (2) is also sufficient since we know the radius is one-half of the diameter.
If you chose (B), Statement (1) is also sufficient since the problem specified there was “no extra room inside the box.”
If you chose (C), the statements are actually independently sufficient already. You may have needed to draw and label a diagram to better visualize the question.
If you chose (E), the statements are sufficient on their own. Try some more word problems involving data sufficiency to better get the hang of mining the length descriptions in these questions for the important information.
General Discussion
Re: Machine A is made up of a rectangular box filled with x cylinders of b
[#permalink]
12 Feb 2015, 08:12
12 Feb 2015, 08:12
1
Kudos
statement 1>> we have 9 cylinders from which we can calculate the radius of cylinders which can use used to calculate cylinders along the width and we can find out X. sufficient
statement 2>> radius of bearing = radius of cylinders which can use used to calculate cylinders along the width and length and we can find out X. sufficient
D
statement 2>> radius of bearing = radius of cylinders which can use used to calculate cylinders along the width and length and we can find out X. sufficient
D
