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 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 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.
27 Mar 2016, 01:42
Kudos
Bookmarks
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
77% (01:41) correct
23%
(01:54)
wrong
based on 124
sessions
History
Date
Time
Result
Not Attempted Yet
Attachment:
circle+rectangle.jpg [ 4.95 KiB | Viewed 2711 times ]
A circle and a rectangle are there shown as above figure. If the area of the circle is 100π, what is the perimeter of the rectangle?
1) The one side length of the rectangle except the radius is 20
2) The area shaded is 200-25π
* A solution will be posted in two days.
27 Mar 2016, 04:04
Kudos
Bookmarks
Area of the circle = 100*pi --> R = 10 = Width
Perimeter of rectangle = 2(Length + Width) --> We have to find the Length.
St1: One side length = 20 --> We know that Width = 10. So the given side is the Length of the rectange. Perimeter can be found out. Sufficient
St2: Area of shaded region = 200 - 25*pi
Area of unshaded region in the rectangle = (1/4)*100*pi = 25*pi
Area of rectangle = 200 - 25pi + 25pi = 200
Length * Width = 200
Length = 200/10 = 20.
Sufficient.
Answer: D
Perimeter of rectangle = 2(Length + Width) --> We have to find the Length.
St1: One side length = 20 --> We know that Width = 10. So the given side is the Length of the rectange. Perimeter can be found out. Sufficient
St2: Area of shaded region = 200 - 25*pi
Area of unshaded region in the rectangle = (1/4)*100*pi = 25*pi
Area of rectangle = 200 - 25pi + 25pi = 200
Length * Width = 200
Length = 200/10 = 20.
Sufficient.
Answer: D
28 Mar 2016, 22:38
Kudos
Bookmarks
Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.
A circle and a rectangle are there shown as above figure. If the area of the circle is 100π, what is the perimeter of the rectangle?
1) The one side length of the rectangle except the radius is 20
2) The area shaded is 200-25π
perimeter.jpg [ 3.89 KiB | Viewed 2567 times ]
As above the picture, suppose one side of the rectangle is a, which makes 1 variable(a). In order to match with the number of equations, you need 1 equation.
For 1) 1 equation, for 2) 1 equation, which is likely to make D the answer.
1) a=10 unique –> unique and sufficient.
2) a=10 unique -> unique and sufficient.
Thus, the answer is D.
A circle and a rectangle are there shown as above figure. If the area of the circle is 100π, what is the perimeter of the rectangle?
1) The one side length of the rectangle except the radius is 20
2) The area shaded is 200-25π
Attachment:
perimeter.jpg [ 3.89 KiB | Viewed 2567 times ]
For 1) 1 equation, for 2) 1 equation, which is likely to make D the answer.
1) a=10 unique –> unique and sufficient.
2) a=10 unique -> unique and sufficient.
Thus, the answer is D.
