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by daretodream » Thu Feb 18, 2010 11:27 pm
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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Source: — Data Sufficiency |
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by ajith » Thu Feb 18, 2010 11:34 pm
daretodream 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.
1. )Sufficient - 300% is 2*3 =6 MB 100% - 2MB
2.) Sufficient - (x+3)*1.6 = (x+6); x = 2 MB

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by thephoenix » Fri Feb 19, 2010 1:58 am
daretodream 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.

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

[increase by 300% = 4 times increase].

(2) x+6=1.6(x+3) --> x=2. Sufficient.
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by shashank.ism » Sun Feb 21, 2010 12:51 pm
daretodream 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.
M-type memory unit will increase the base memory capacity of a certain computer by 3 megabytes.
let x be the base memory
St.1) 2 M-type memory units will increase the computers base memory capacity by 6 Megabytes
so x+6 = 4x --> 3x=6 --> x=2 ===============suff.
St.2)
so 6 +x =1.6(x+3) --> 6-4.8 = (1.6-1)x ==> x = 1.2/.6 =2 suff..

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