|
|
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.
18 Mar 2016, 00:13
Kudos
Bookmarks
A
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:
81% (01:41) correct
19%
(01:59)
wrong
based on 320
sessions
History
Date
Time
Result
Not Attempted Yet
If \(10x + 10y + 16x^2 + 25y^2 = 10 + z\), what is the value of x + y?
(1) \(z = (4x)^2 + (5y)^2\)
(2) \(x = 1\)
(1) \(z = (4x)^2 + (5y)^2\)
(2) \(x = 1\)
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
Data Sufficiency Forum
Data Sufficiency Forum
18 Mar 2016, 01:50
Kudos
Bookmarks
St1: z = \(16x^2 + 25y^2\) --> 10(x + y) = 10 --> x + y = 1. Sufficient
St2: Clearly insufficient as we do not know the value of y and z
Answer: A
St2: Clearly insufficient as we do not know the value of y and z
Answer: A
19 Mar 2016, 23:19
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.
If 10x+10y+16x^2+25y^2=10+z , what is the value of x + y?
(1) z=(4x)^2+(5y)^2
(2) x=1
When you modify the original condition and the question, x+y=(10+z-16x^2-25y^2)/10 is derived. For 1), x+y=1 is derived from z=16x^2+25y^2, which is sufficient. The answer is A.
Once we modify the original condition and the question according to the variable approach method 1, we can solve approximately 30% of DS questions.
If 10x+10y+16x^2+25y^2=10+z , what is the value of x + y?
(1) z=(4x)^2+(5y)^2
(2) x=1
When you modify the original condition and the question, x+y=(10+z-16x^2-25y^2)/10 is derived. For 1), x+y=1 is derived from z=16x^2+25y^2, which is sufficient. The answer is A.
Once we modify the original condition and the question according to the variable approach method 1, we can solve approximately 30% of DS questions.
