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Each M-type memory unit will increase the base memory

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Each M-type memory unit will increase the base memory [#permalink]

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New post 18 Jun 2009, 13:32
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Each M-type memory unit will increase the base memory capacity of a certain computer by 3 megabytes. What is the base memory capacity, in megabytes of the computer?

(1) 2 M-type memory units will increase the computers base memory capacity by 300 percent
(2) The memory capacity of the computer after 2 M-type memory units are added to the base memory capacity is 1.6 times the memory capacity of the computer after 1 M-type memory unit is added to the base memory capacity.

OPEN DISCUSSION OF THIS QUESTION IS HERE: https://gmatclub.com/forum/each-m-type- ... 06395.html
[Reveal] Spoiler: OA

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Re: Each M-type memory unit will increase the base memory [#permalink]

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New post 19 Jun 2009, 20:25
D

Stm 1.
B+2M = 300% of B + B
B + 6 = 4B
B =2
Suff.

Stmt 2 -
B + 2M = 1.6(B+M)
B + 6 = 1.6B + 4.8
B=2
Suff.

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New post 19 Jun 2009, 22:25
mdfrahim wrote:
D

Stm 1.
B+2M = 300% of B + B
B + 6 = 4B
B =2
Suff.

Stmt 2 -
B + 2M = 1.6(B+M)
B + 6 = 1.6B + 4.8
B=2
Suff.


yes..! I agree with D
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New post 14 Dec 2009, 22:56
Each M-type memory unit will increase the base memory capacity of a certain computer by 3 megabytes. What is the base memory capacity, in megabytes of the computer?

(1) 2 M-type memory units will increase the computers base memory capacity by 300 percent
(2) The memory capacity of the computer after 2 M-type memory units are added to the base memory capacity is 1.6 times the memory capacity of the computer after 1 M-type memory unit is added to the base memory capacity.

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New post 14 Dec 2009, 23:18
IMO D

from q stem we get
if base mem=x
1M will inc base mem by 3---->x+3
2m--->2x+6

s1) [(2x+6)-x]/x=3 ---> solving x=3 hence suff
s2) 2x+6+x=1.6(x+3+x)---->solving x=6 hence suff

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New post 14 Dec 2009, 23:44
IMO D

s1) one eqn and one variable hence suff
s2) same one eqn and one variable hence suff
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New post 15 Dec 2009, 03:38
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delta09 wrote:
Each M-type memory unit will increase the base memory capacity of a certain computer by 3 megabytes. What is the base memory capacity, in megabytes of the computer?

(1) 2 M-type memory units will increase the computers base memory capacity by 300 percent
(2) The memory capacity of the computer after 2 M-type memory units are added to the base memory capacity is 1.6 times the memory capacity of the computer after 1 M-type memory unit is added to the base memory capacity.

IMO D

from q stem we get
if base mem=x
1M will inc base mem by 3---->x+3
2m--->2x+6

s1) [(2x+6)-x]/x=3 ---> solving x=3 hence suff
s2) 2x+6+x=1.6(x+3+x)---->solving x=6 hence suff


Answer is D. But the above solution is not correct. The first indication of this is that the values of x from statement 1 and 2 are different. This never occur in GMAT.

Statements in DS never contradict, nor they are giving the different answers.

(1) x+6=4x --> x=2. Sufficient.

Note that increase by 300% equals to 4 times increase.

(2) x+6=1.6(x+3) --> x=2. Sufficient.

Answer: D.
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New post 15 Dec 2009, 07:26
Thank you, thank u Bunel, I got this one, but was cross checking.

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New post 10 Jul 2011, 12:51
I have a small dobut...as per the question stem "Each M-type memory unit will increase the base memory capacity of a certain computer by 3 megabytes. "...shouldn't the equation be "M = B +3" instead of "M = 3" which is taken in the above scenario.

I might be totally wrong..pls suggest!

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New post 05 Dec 2013, 09:00
Each M-type memory unit will increase the base memory capacity of a certain computer by 3 megabytes. What is the base memory capacity, in megabytes of the computer?
(1) 2 M-type memory units will increase the computers base memory capacity by 300 percent
(2) The memory capacity of the computer after 2 M-type memory units are added to the base memory capacity is 1.6 times the memory capacity of the computer after 1 M-type memory unit is added to the base memory capacity.

Hi, the answer to above question is D i.e both the statements are individually sufficient to answer. However, I am unable to comprehend the question. Please help.

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New post 05 Dec 2013, 09:07
Vidhi1 wrote:
Each M-type memory unit will increase the base memory capacity of a certain computer by 3 megabytes. What is the base memory capacity, in megabytes of the computer?
(1) 2 M-type memory units will increase the computers base memory capacity by 300 percent
(2) The memory capacity of the computer after 2 M-type memory units are added to the base memory capacity is 1.6 times the memory capacity of the computer after 1 M-type memory unit is added to the base memory capacity.

Hi, the answer to above question is D i.e both the statements are individually sufficient to answer. However, I am unable to comprehend the question. Please help.


Merging similar topics. Please refer to the solutions above.
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Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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New post 05 Dec 2017, 22:00

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Re: Each M-type memory unit will increase the base memory   [#permalink] 05 Dec 2017, 22:00
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