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Each M-type memory unit will increase the base memory

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

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18 Jun 2009, 13:32
00:00

Difficulty:

25% (medium)

Question Stats:

80% (01:07) correct 20% (01:32) wrong based on 71 sessions

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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: each-m-type-unit-will-increase-the-base-memory-capacity-of-a-certain-c-206395.html

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Lahoosaher

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

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

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

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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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Joined: 14 Dec 2009
Posts: 18
Re: Each M-type memory unit will increase the base memory  [#permalink]

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14 Dec 2009, 23:18
1
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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Re: Each M-type memory unit will increase the base memory  [#permalink]

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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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Joined: 02 Sep 2009
Posts: 52431
Re: Each M-type memory unit will increase the base memory  [#permalink]

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15 Dec 2009, 03:38
1
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.

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

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15 Dec 2009, 07:26
Thank you, thank u Bunel, I got this one, but was cross checking.
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Posts: 201
Re: Each M-type memory unit will increase the base memory  [#permalink]

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

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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.

Math Expert
Joined: 02 Sep 2009
Posts: 52431
Re: Each M-type memory unit will increase the base memory  [#permalink]

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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.

Merging similar topics. Please refer to the solutions above.
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Math Expert
Joined: 02 Sep 2009
Posts: 52431
Re: Each M-type memory unit will increase the base memory  [#permalink]

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05 Dec 2017, 22:00
OPEN DISCUSSION OF THIS QUESTION IS HERE: each-m-type-unit-will-increase-the-base-memory-capacity-of-a-certain-c-206395.html

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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